Finding the Fourth Proportional to 12,986.16, 17,930.50 and 7,957.25

Step by Step Solution

1. Step 1: Write the proportion equation
   12,986.16 : 17,930.50 = 7,957.25 : x
2. Step 2: Convert to fraction form
   12,986.16/17,930.50 = 7,957.25/x
3. Step 3: Cross multiply
   12,986.16x = 17,930.50 × 7,957.25
4. Step 4: Simplify right side
   12,986.16x = 142,677,471.13
5. Step 5: Solve for x
   x = 142,677,471.13/12,986.16
6. Step 6: Final answer
   x = 10,986.89