Finding the Fourth Proportional to 21,088.76, 31,648.56 and 15,557.02

Step by Step Solution

1. Step 1: Write the proportion equation
   21,088.76 : 31,648.56 = 15,557.02 : x
2. Step 2: Convert to fraction form
   21,088.76/31,648.56 = 15,557.02/x
3. Step 3: Cross multiply
   21,088.76x = 31,648.56 × 15,557.02
4. Step 4: Simplify right side
   21,088.76x = 492,357,280.89
5. Step 5: Solve for x
   x = 492,357,280.89/21,088.76
6. Step 6: Final answer
   x = 23,346.91