Finding the Fourth Proportional to 13,132.55, 18,123.18 and 7,164.38

Step by Step Solution

1. Step 1: Write the proportion equation
   13,132.55 : 18,123.18 = 7,164.38 : x
2. Step 2: Convert to fraction form
   13,132.55/18,123.18 = 7,164.38/x
3. Step 3: Cross multiply
   13,132.55x = 18,123.18 × 7,164.38
4. Step 4: Simplify right side
   13,132.55x = 129,841,348.33
5. Step 5: Solve for x
   x = 129,841,348.33/13,132.55
6. Step 6: Final answer
   x = 9,886.99