Finding the Fourth Proportional to 9,059.39, 12,585.66 and 8,978.29

Step by Step Solution

1. Step 1: Write the proportion equation
   9,059.39 : 12,585.66 = 8,978.29 : x
2. Step 2: Convert to fraction form
   9,059.39/12,585.66 = 8,978.29/x
3. Step 3: Cross multiply
   9,059.39x = 12,585.66 × 8,978.29
4. Step 4: Simplify right side
   9,059.39x = 112,997,673.86
5. Step 5: Solve for x
   x = 112,997,673.86/9,059.39
6. Step 6: Final answer
   x = 12,473.00