Finding the Fourth Proportional to 7,990.91, 11,032.58 and 7,150.15

Step by Step Solution

1. Step 1: Write the proportion equation
   7,990.91 : 11,032.58 = 7,150.15 : x
2. Step 2: Convert to fraction form
   7,990.91/11,032.58 = 7,150.15/x
3. Step 3: Cross multiply
   7,990.91x = 11,032.58 × 7,150.15
4. Step 4: Simplify right side
   7,990.91x = 78,884,633.55
5. Step 5: Solve for x
   x = 78,884,633.55/7,990.91
6. Step 6: Final answer
   x = 9,871.80