Finding the Fourth Proportional to 28,501.92, 42,757.56 and 8,780.04

Step by Step Solution

1. Step 1: Write the proportion equation
   28,501.92 : 42,757.56 = 8,780.04 : x
2. Step 2: Convert to fraction form
   28,501.92/42,757.56 = 8,780.04/x
3. Step 3: Cross multiply
   28,501.92x = 42,757.56 × 8,780.04
4. Step 4: Simplify right side
   28,501.92x = 375,413,087.10
5. Step 5: Solve for x
   x = 375,413,087.10/28,501.92
6. Step 6: Final answer
   x = 13,171.50