Finding the Fourth Proportional to 8,164.80, 12,154.86 and 8,116.20

Step by Step Solution

1. Step 1: Write the proportion equation
   8,164.80 : 12,154.86 = 8,116.20 : x
2. Step 2: Convert to fraction form
   8,164.80/12,154.86 = 8,116.20/x
3. Step 3: Cross multiply
   8,164.80x = 12,154.86 × 8,116.20
4. Step 4: Simplify right side
   8,164.80x = 98,651,274.73
5. Step 5: Solve for x
   x = 98,651,274.73/8,164.80
6. Step 6: Final answer
   x = 12,082.51