Finding the Fourth Proportional to 9,057.70, 12,499.68 and 5,078.98

Step by Step Solution

1. Step 1: Write the proportion equation
   9,057.70 : 12,499.68 = 5,078.98 : x
2. Step 2: Convert to fraction form
   9,057.70/12,499.68 = 5,078.98/x
3. Step 3: Cross multiply
   9,057.70x = 12,499.68 × 5,078.98
4. Step 4: Simplify right side
   9,057.70x = 63,485,624.73
5. Step 5: Solve for x
   x = 63,485,624.73/9,057.70
6. Step 6: Final answer
   x = 7,009.02