Finding the Fourth Proportional to 13,132.79, 18,123.71 and 7,164.79

Step by Step Solution

1. Step 1: Write the proportion equation
   13,132.79 : 18,123.71 = 7,164.79 : x
2. Step 2: Convert to fraction form
   13,132.79/18,123.71 = 7,164.79/x
3. Step 3: Cross multiply
   13,132.79x = 18,123.71 × 7,164.79
4. Step 4: Simplify right side
   13,132.79x = 129,852,449.73
5. Step 5: Solve for x
   x = 129,852,449.73/13,132.79
6. Step 6: Final answer
   x = 9,887.65