Finding the Fourth Proportional to 12,390.57, 17,098.61 and 6,725.05

Step by Step Solution

1. Step 1: Write the proportion equation
   12,390.57 : 17,098.61 = 6,725.05 : x
2. Step 2: Convert to fraction form
   12,390.57/17,098.61 = 6,725.05/x
3. Step 3: Cross multiply
   12,390.57x = 17,098.61 × 6,725.05
4. Step 4: Simplify right side
   12,390.57x = 114,988,973.56
5. Step 5: Solve for x
   x = 114,988,973.56/12,390.57
6. Step 6: Final answer
   x = 9,280.36