Finding the Fourth Proportional to 12,390.16, 17,098.59 and 6,724.98

Step by Step Solution

1. Step 1: Write the proportion equation
   12,390.16 : 17,098.59 = 6,724.98 : x
2. Step 2: Convert to fraction form
   12,390.16/17,098.59 = 6,724.98/x
3. Step 3: Cross multiply
   12,390.16x = 17,098.59 × 6,724.98
4. Step 4: Simplify right side
   12,390.16x = 114,987,675.78
5. Step 5: Solve for x
   x = 114,987,675.78/12,390.16
6. Step 6: Final answer
   x = 9,280.56