Finding the Fourth Proportional to 13,123.62, 18,110.48 and 7,155.18

Step by Step Solution

1. Step 1: Write the proportion equation
   13,123.62 : 18,110.48 = 7,155.18 : x
2. Step 2: Convert to fraction form
   13,123.62/18,110.48 = 7,155.18/x
3. Step 3: Cross multiply
   13,123.62x = 18,110.48 × 7,155.18
4. Step 4: Simplify right side
   13,123.62x = 129,583,744.29
5. Step 5: Solve for x
   x = 129,583,744.29/13,123.62
6. Step 6: Final answer
   x = 9,874.09