Finding the Fourth Proportional to 13,123.57, 18,110.60 and 7,155.34

Step by Step Solution

1. Step 1: Write the proportion equation
   13,123.57 : 18,110.60 = 7,155.34 : x
2. Step 2: Convert to fraction form
   13,123.57/18,110.60 = 7,155.34/x
3. Step 3: Cross multiply
   13,123.57x = 18,110.60 × 7,155.34
4. Step 4: Simplify right side
   13,123.57x = 129,587,427.94
5. Step 5: Solve for x
   x = 129,587,427.94/13,123.57
6. Step 6: Final answer
   x = 9,874.41