Finding the Fourth Proportional to 13,100.91, 18,079.15 and 7,132.57

Step by Step Solution

1. Step 1: Write the proportion equation
   13,100.91 : 18,079.15 = 7,132.57 : x
2. Step 2: Convert to fraction form
   13,100.91/18,079.15 = 7,132.57/x
3. Step 3: Cross multiply
   13,100.91x = 18,079.15 × 7,132.57
4. Step 4: Simplify right side
   13,100.91x = 128,950,834.43
5. Step 5: Solve for x
   x = 128,950,834.43/13,100.91
6. Step 6: Final answer
   x = 9,842.89