Finding the Fourth Proportional to 10,968.30, 15,129.29 and 7,191.71

Step by Step Solution

1. Step 1: Write the proportion equation
   10,968.30 : 15,129.29 = 7,191.71 : x
2. Step 2: Convert to fraction form
   10,968.30/15,129.29 = 7,191.71/x
3. Step 3: Cross multiply
   10,968.30x = 15,129.29 × 7,191.71
4. Step 4: Simplify right side
   10,968.30x = 108,805,468.05
5. Step 5: Solve for x
   x = 108,805,468.05/10,968.30
6. Step 6: Final answer
   x = 9,919.99