Finding the Fourth Proportional to 28,619.60, 42,932.12 and 8,892.86

Step by Step Solution

1. Step 1: Write the proportion equation
   28,619.60 : 42,932.12 = 8,892.86 : x
2. Step 2: Convert to fraction form
   28,619.60/42,932.12 = 8,892.86/x
3. Step 3: Cross multiply
   28,619.60x = 42,932.12 × 8,892.86
4. Step 4: Simplify right side
   28,619.60x = 381,789,073.54
5. Step 5: Solve for x
   x = 381,789,073.54/28,619.60
6. Step 6: Final answer
   x = 13,340.13