Finding the Fourth Proportional to 13,133.18, 18,123.92 and 7,164.89

Step by Step Solution

1. Step 1: Write the proportion equation
   13,133.18 : 18,123.92 = 7,164.89 : x
2. Step 2: Convert to fraction form
   13,133.18/18,123.92 = 7,164.89/x
3. Step 3: Cross multiply
   13,133.18x = 18,123.92 × 7,164.89
4. Step 4: Simplify right side
   13,133.18x = 129,855,861.56
5. Step 5: Solve for x
   x = 129,855,861.56/13,133.18
6. Step 6: Final answer
   x = 9,887.62