Finding the Fourth Proportional to 28,402.28, 42,601.87 and 8,680.83

Step by Step Solution

1. Step 1: Write the proportion equation
   28,402.28 : 42,601.87 = 8,680.83 : x
2. Step 2: Convert to fraction form
   28,402.28/42,601.87 = 8,680.83/x
3. Step 3: Cross multiply
   28,402.28x = 42,601.87 × 8,680.83
4. Step 4: Simplify right side
   28,402.28x = 369,819,591.15
5. Step 5: Solve for x
   x = 369,819,591.15/28,402.28
6. Step 6: Final answer
   x = 13,020.77