Finding the Fourth Proportional to 12,816.70, 17,686.68 and 7,151.47

Step by Step Solution

1. Step 1: Write the proportion equation
   12,816.70 : 17,686.68 = 7,151.47 : x
2. Step 2: Convert to fraction form
   12,816.70/17,686.68 = 7,151.47/x
3. Step 3: Cross multiply
   12,816.70x = 17,686.68 × 7,151.47
4. Step 4: Simplify right side
   12,816.70x = 126,485,761.42
5. Step 5: Solve for x
   x = 126,485,761.42/12,816.70
6. Step 6: Final answer
   x = 9,868.82