Your answer, "4,000", is not correct.
The correct answer to
How many horse stalls did Solomon have?
is
40,000
as shown by
1 Kings 4:26
which is
- KJV
- And Solomon had forty thousand stalls of horses for his chariots, and twelve thousand horsemen.
- NIV
- Solomon had four {Some Septuagint manuscripts (see also 2 Chron. 9:25); Hebrew forty} thousand stalls for chariot horses, and twelve thousand horses. {Or charioteers}