Finding the Fourth Proportional to 13,123.61, 18,110.96 and 7,155.38

Step by Step Solution

1. Step 1: Write the proportion equation
   13,123.61 : 18,110.96 = 7,155.38 : x
2. Step 2: Convert to fraction form
   13,123.61/18,110.96 = 7,155.38/x
3. Step 3: Cross multiply
   13,123.61x = 18,110.96 × 7,155.38
4. Step 4: Simplify right side
   13,123.61x = 129,590,800.96
5. Step 5: Solve for x
   x = 129,590,800.96/13,123.61
6. Step 6: Final answer
   x = 9,874.63