Finding the Fourth Proportional to 12,439.98, 17,165.52 and 7,662.60

Step by Step Solution

1. Step 1: Write the proportion equation
   12,439.98 : 17,165.52 = 7,662.60 : x
2. Step 2: Convert to fraction form
   12,439.98/17,165.52 = 7,662.60/x
3. Step 3: Cross multiply
   12,439.98x = 17,165.52 × 7,662.60
4. Step 4: Simplify right side
   12,439.98x = 131,532,513.55
5. Step 5: Solve for x
   x = 131,532,513.55/12,439.98
6. Step 6: Final answer
   x = 10,573.37