Finding the Fourth Proportional to 13,132.72, 18,122.82 and 7,164.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,132.72 : 18,122.82 = 7,164.50 : x
2. Step 2: Convert to fraction form
   13,132.72/18,122.82 = 7,164.50/x
3. Step 3: Cross multiply
   13,132.72x = 18,122.82 × 7,164.50
4. Step 4: Simplify right side
   13,132.72x = 129,840,943.89
5. Step 5: Solve for x
   x = 129,840,943.89/13,132.72
6. Step 6: Final answer
   x = 9,886.83