Finding the Fourth Proportional to 8,158.86, 11,174.88 and 7,680.12

Step by Step Solution

1. Step 1: Write the proportion equation
   8,158.86 : 11,174.88 = 7,680.12 : x
2. Step 2: Convert to fraction form
   8,158.86/11,174.88 = 7,680.12/x
3. Step 3: Cross multiply
   8,158.86x = 11,174.88 × 7,680.12
4. Step 4: Simplify right side
   8,158.86x = 85,824,419.39
5. Step 5: Solve for x
   x = 85,824,419.39/8,158.86
6. Step 6: Final answer
   x = 10,519.17