Finding the Fourth Proportional to 13,124.16, 18,111.12 and 7,155.87

Step by Step Solution

1. Step 1: Write the proportion equation
   13,124.16 : 18,111.12 = 7,155.87 : x
2. Step 2: Convert to fraction form
   13,124.16/18,111.12 = 7,155.87/x
3. Step 3: Cross multiply
   13,124.16x = 18,111.12 × 7,155.87
4. Step 4: Simplify right side
   13,124.16x = 129,600,820.27
5. Step 5: Solve for x
   x = 129,600,820.27/13,124.16
6. Step 6: Final answer
   x = 9,874.98