Finding the Fourth Proportional to 13,123.71, 18,110.73 and 7,155.32

Step by Step Solution

1. Step 1: Write the proportion equation
   13,123.71 : 18,110.73 = 7,155.32 : x
2. Step 2: Convert to fraction form
   13,123.71/18,110.73 = 7,155.32/x
3. Step 3: Cross multiply
   13,123.71x = 18,110.73 × 7,155.32
4. Step 4: Simplify right side
   13,123.71x = 129,587,978.03
5. Step 5: Solve for x
   x = 129,587,978.03/13,123.71
6. Step 6: Final answer
   x = 9,874.34