Finding the Fourth Proportional to 9,057.86, 12,499.64 and 5,078.88

Step by Step Solution

1. Step 1: Write the proportion equation
   9,057.86 : 12,499.64 = 5,078.88 : x
2. Step 2: Convert to fraction form
   9,057.86/12,499.64 = 5,078.88/x
3. Step 3: Cross multiply
   9,057.86x = 12,499.64 × 5,078.88
4. Step 4: Simplify right side
   9,057.86x = 63,484,171.60
5. Step 5: Solve for x
   x = 63,484,171.60/9,057.86
6. Step 6: Final answer
   x = 7,008.74