Finding the Fourth Proportional to 9,059.14, 12,585.31 and 8,978.04

Step by Step Solution

1. Step 1: Write the proportion equation
   9,059.14 : 12,585.31 = 8,978.04 : x
2. Step 2: Convert to fraction form
   9,059.14/12,585.31 = 8,978.04/x
3. Step 3: Cross multiply
   9,059.14x = 12,585.31 × 8,978.04
4. Step 4: Simplify right side
   9,059.14x = 112,991,353.67
5. Step 5: Solve for x
   x = 112,991,353.67/9,059.14
6. Step 6: Final answer
   x = 12,472.64