Finding the Fourth Proportional to 9,036.60, 12,470.06 and 5,057.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,036.60 : 12,470.06 = 5,057.72 : x
2. Step 2: Convert to fraction form
   9,036.60/12,470.06 = 5,057.72/x
3. Step 3: Cross multiply
   9,036.60x = 12,470.06 × 5,057.72
4. Step 4: Simplify right side
   9,036.60x = 63,070,071.86
5. Step 5: Solve for x
   x = 63,070,071.86/9,036.60
6. Step 6: Final answer
   x = 6,979.40