Finding the Fourth Proportional to 13,132.27, 18,122.78 and 7,164.16

Step by Step Solution

1. Step 1: Write the proportion equation
   13,132.27 : 18,122.78 = 7,164.16 : x
2. Step 2: Convert to fraction form
   13,132.27/18,122.78 = 7,164.16/x
3. Step 3: Cross multiply
   13,132.27x = 18,122.78 × 7,164.16
4. Step 4: Simplify right side
   13,132.27x = 129,834,495.56
5. Step 5: Solve for x
   x = 129,834,495.56/13,132.27
6. Step 6: Final answer
   x = 9,886.68