Finding the Fourth Proportional to 9,036.90, 12,470.55 and 5,057.28

Step by Step Solution

1. Step 1: Write the proportion equation
   9,036.90 : 12,470.55 = 5,057.28 : x
2. Step 2: Convert to fraction form
   9,036.90/12,470.55 = 5,057.28/x
3. Step 3: Cross multiply
   9,036.90x = 12,470.55 × 5,057.28
4. Step 4: Simplify right side
   9,036.90x = 63,067,063.10
5. Step 5: Solve for x
   x = 63,067,063.10/9,036.90
6. Step 6: Final answer
   x = 6,978.84