Finding the Fourth Proportional to 12,766.32, 17,617.91 and 7,731.45

Step by Step Solution

1. Step 1: Write the proportion equation
   12,766.32 : 17,617.91 = 7,731.45 : x
2. Step 2: Convert to fraction form
   12,766.32/17,617.91 = 7,731.45/x
3. Step 3: Cross multiply
   12,766.32x = 17,617.91 × 7,731.45
4. Step 4: Simplify right side
   12,766.32x = 136,211,951.61
5. Step 5: Solve for x
   x = 136,211,951.61/12,766.32
6. Step 6: Final answer
   x = 10,669.63