Finding the Fourth Proportional to 12,806.55, 17,672.43 and 7,141.92

Step by Step Solution

1. Step 1: Write the proportion equation
   12,806.55 : 17,672.43 = 7,141.92 : x
2. Step 2: Convert to fraction form
   12,806.55/17,672.43 = 7,141.92/x
3. Step 3: Cross multiply
   12,806.55x = 17,672.43 × 7,141.92
4. Step 4: Simplify right side
   12,806.55x = 126,215,081.27
5. Step 5: Solve for x
   x = 126,215,081.27/12,806.55
6. Step 6: Final answer
   x = 9,855.51