Finding the Fourth Proportional to 13,123.56, 18,110.52 and 7,155.12

Step by Step Solution

1. Step 1: Write the proportion equation
   13,123.56 : 18,110.52 = 7,155.12 : x
2. Step 2: Convert to fraction form
   13,123.56/18,110.52 = 7,155.12/x
3. Step 3: Cross multiply
   13,123.56x = 18,110.52 × 7,155.12
4. Step 4: Simplify right side
   13,123.56x = 129,582,943.86
5. Step 5: Solve for x
   x = 129,582,943.86/13,123.56
6. Step 6: Final answer
   x = 9,874.07