Finding the Fourth Proportional to 28,501.71, 42,757.15 and 8,780.26

Step by Step Solution

1. Step 1: Write the proportion equation
   28,501.71 : 42,757.15 = 8,780.26 : x
2. Step 2: Convert to fraction form
   28,501.71/42,757.15 = 8,780.26/x
3. Step 3: Cross multiply
   28,501.71x = 42,757.15 × 8,780.26
4. Step 4: Simplify right side
   28,501.71x = 375,418,893.86
5. Step 5: Solve for x
   x = 375,418,893.86/28,501.71
6. Step 6: Final answer
   x = 13,171.80