Finding the Fourth Proportional to 13,132.50, 18,123.18 and 7,164.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,132.50 : 18,123.18 = 7,164.72 : x
2. Step 2: Convert to fraction form
   13,132.50/18,123.18 = 7,164.72/x
3. Step 3: Cross multiply
   13,132.50x = 18,123.18 × 7,164.72
4. Step 4: Simplify right side
   13,132.50x = 129,847,510.21
5. Step 5: Solve for x
   x = 129,847,510.21/13,132.50
6. Step 6: Final answer
   x = 9,887.49