Finding the Fourth Proportional to 12,816.34, 17,686.49 and 7,151.10

Step by Step Solution

1. Step 1: Write the proportion equation
   12,816.34 : 17,686.49 = 7,151.10 : x
2. Step 2: Convert to fraction form
   12,816.34/17,686.49 = 7,151.10/x
3. Step 3: Cross multiply
   12,816.34x = 17,686.49 × 7,151.10
4. Step 4: Simplify right side
   12,816.34x = 126,477,796.78
5. Step 5: Solve for x
   x = 126,477,796.78/12,816.34
6. Step 6: Final answer
   x = 9,868.48