Finding the Fourth Proportional to 31,787.50, 43,874.82 and 21,720.02

Step by Step Solution

1. Step 1: Write the proportion equation
   31,787.50 : 43,874.82 = 21,720.02 : x
2. Step 2: Convert to fraction form
   31,787.50/43,874.82 = 21,720.02/x
3. Step 3: Cross multiply
   31,787.50x = 43,874.82 × 21,720.02
4. Step 4: Simplify right side
   31,787.50x = 952,961,967.90
5. Step 5: Solve for x
   x = 952,961,967.90/31,787.50
6. Step 6: Final answer
   x = 29,979.14