Finding the Fourth Proportional to 21,585.60, 29,787.04 and 12,154.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,585.60 : 29,787.04 = 12,154.72 : x
2. Step 2: Convert to fraction form
   21,585.60/29,787.04 = 12,154.72/x
3. Step 3: Cross multiply
   21,585.60x = 29,787.04 × 12,154.72
4. Step 4: Simplify right side
   21,585.60x = 362,053,130.83
5. Step 5: Solve for x
   x = 362,053,130.83/21,585.60
6. Step 6: Final answer
   x = 16,772.90