Finding the Fourth Proportional to 12,040.86, 18,057.12 and 5,715

Step by Step Solution

1. Step 1: Write the proportion equation
   12,040.86 : 18,057.12 = 5,715 : x
2. Step 2: Convert to fraction form
   12,040.86/18,057.12 = 5,715/x
3. Step 3: Cross multiply
   12,040.86x = 18,057.12 × 5,715
4. Step 4: Simplify right side
   12,040.86x = 103,196,440.80
5. Step 5: Solve for x
   x = 103,196,440.80/12,040.86
6. Step 6: Final answer
   x = 8,570.52