Finding the Fourth Proportional to 12,485.31, 17,230.24 and 7,180.13

Step by Step Solution

1. Step 1: Write the proportion equation
   12,485.31 : 17,230.24 = 7,180.13 : x
2. Step 2: Convert to fraction form
   12,485.31/17,230.24 = 7,180.13/x
3. Step 3: Cross multiply
   12,485.31x = 17,230.24 × 7,180.13
4. Step 4: Simplify right side
   12,485.31x = 123,715,363.13
5. Step 5: Solve for x
   x = 123,715,363.13/12,485.31
6. Step 6: Final answer
   x = 9,908.87