Finding the Fourth Proportional to 13,123.17, 18,110.54 and 7,155.18

Step by Step Solution

1. Step 1: Write the proportion equation
   13,123.17 : 18,110.54 = 7,155.18 : x
2. Step 2: Convert to fraction form
   13,123.17/18,110.54 = 7,155.18/x
3. Step 3: Cross multiply
   13,123.17x = 18,110.54 × 7,155.18
4. Step 4: Simplify right side
   13,123.17x = 129,584,191.49
5. Step 5: Solve for x
   x = 129,584,191.49/13,123.17
6. Step 6: Final answer
   x = 9,874.46