Finding the Fourth Proportional to 13,123.82, 18,110.55 and 7,155.61

Step by Step Solution

1. Step 1: Write the proportion equation
   13,123.82 : 18,110.55 = 7,155.61 : x
2. Step 2: Convert to fraction form
   13,123.82/18,110.55 = 7,155.61/x
3. Step 3: Cross multiply
   13,123.82x = 18,110.55 × 7,155.61
4. Step 4: Simplify right side
   13,123.82x = 129,592,021.37
5. Step 5: Solve for x
   x = 129,592,021.37/13,123.82
6. Step 6: Final answer
   x = 9,874.56