Finding the Fourth Proportional to 13,123.32, 18,109.92 and 7,155.02

Step by Step Solution

1. Step 1: Write the proportion equation
   13,123.32 : 18,109.92 = 7,155.02 : x
2. Step 2: Convert to fraction form
   13,123.32/18,109.92 = 7,155.02/x
3. Step 3: Cross multiply
   13,123.32x = 18,109.92 × 7,155.02
4. Step 4: Simplify right side
   13,123.32x = 129,576,839.80
5. Step 5: Solve for x
   x = 129,576,839.80/13,123.32
6. Step 6: Final answer
   x = 9,873.78