Finding the Fourth Proportional to 9,036.60, 12,469.42 and 5,057.40

Step by Step Solution

1. Step 1: Write the proportion equation
   9,036.60 : 12,469.42 = 5,057.40 : x
2. Step 2: Convert to fraction form
   9,036.60/12,469.42 = 5,057.40/x
3. Step 3: Cross multiply
   9,036.60x = 12,469.42 × 5,057.40
4. Step 4: Simplify right side
   9,036.60x = 63,062,844.71
5. Step 5: Solve for x
   x = 63,062,844.71/9,036.60
6. Step 6: Final answer
   x = 6,978.60