Finding the Fourth Proportional to 12,811.02, 17,679.30 and 7,146.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,811.02 : 17,679.30 = 7,146.12 : x
2. Step 2: Convert to fraction form
   12,811.02/17,679.30 = 7,146.12/x
3. Step 3: Cross multiply
   12,811.02x = 17,679.30 × 7,146.12
4. Step 4: Simplify right side
   12,811.02x = 126,338,399.32
5. Step 5: Solve for x
   x = 126,338,399.32/12,811.02
6. Step 6: Final answer
   x = 9,861.70