Finding the Fourth Proportional to 12,439.68, 17,170.56 and 7,730.88

Step by Step Solution

1. Step 1: Write the proportion equation
   12,439.68 : 17,170.56 = 7,730.88 : x
2. Step 2: Convert to fraction form
   12,439.68/17,170.56 = 7,730.88/x
3. Step 3: Cross multiply
   12,439.68x = 17,170.56 × 7,730.88
4. Step 4: Simplify right side
   12,439.68x = 132,743,538.89
5. Step 5: Solve for x
   x = 132,743,538.89/12,439.68
6. Step 6: Final answer
   x = 10,670.98