Finding the Fourth Proportional to 12,766.32, 17,619.15 and 7,730.55

Step by Step Solution

1. Step 1: Write the proportion equation
   12,766.32 : 17,619.15 = 7,730.55 : x
2. Step 2: Convert to fraction form
   12,766.32/17,619.15 = 7,730.55/x
3. Step 3: Cross multiply
   12,766.32x = 17,619.15 × 7,730.55
4. Step 4: Simplify right side
   12,766.32x = 136,205,720.03
5. Step 5: Solve for x
   x = 136,205,720.03/12,766.32
6. Step 6: Final answer
   x = 10,669.15