Finding the Fourth Proportional to 21,592.32, 29,799.52 and 12,639.28

Step by Step Solution

1. Step 1: Write the proportion equation
   21,592.32 : 29,799.52 = 12,639.28 : x
2. Step 2: Convert to fraction form
   21,592.32/29,799.52 = 12,639.28/x
3. Step 3: Cross multiply
   21,592.32x = 29,799.52 × 12,639.28
4. Step 4: Simplify right side
   21,592.32x = 376,644,477.15
5. Step 5: Solve for x
   x = 376,644,477.15/21,592.32
6. Step 6: Final answer
   x = 17,443.45