Finding the Fourth Proportional to 13,116.16, 18,100.31 and 7,147.83

Step by Step Solution

1. Step 1: Write the proportion equation
   13,116.16 : 18,100.31 = 7,147.83 : x
2. Step 2: Convert to fraction form
   13,116.16/18,100.31 = 7,147.83/x
3. Step 3: Cross multiply
   13,116.16x = 18,100.31 × 7,147.83
4. Step 4: Simplify right side
   13,116.16x = 129,377,938.83
5. Step 5: Solve for x
   x = 129,377,938.83/13,116.16
6. Step 6: Final answer
   x = 9,864.01