Finding the Fourth Proportional to 9,057.40, 12,498.63 and 5,078.47

Step by Step Solution

1. Step 1: Write the proportion equation
   9,057.40 : 12,498.63 = 5,078.47 : x
2. Step 2: Convert to fraction form
   9,057.40/12,498.63 = 5,078.47/x
3. Step 3: Cross multiply
   9,057.40x = 12,498.63 × 5,078.47
4. Step 4: Simplify right side
   9,057.40x = 63,473,917.50
5. Step 5: Solve for x
   x = 63,473,917.50/9,057.40
6. Step 6: Final answer
   x = 7,007.96