Finding the Fourth Proportional to 12,485.39, 17,230.35 and 7,180.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,485.39 : 17,230.35 = 7,180.20 : x
2. Step 2: Convert to fraction form
   12,485.39/17,230.35 = 7,180.20/x
3. Step 3: Cross multiply
   12,485.39x = 17,230.35 × 7,180.20
4. Step 4: Simplify right side
   12,485.39x = 123,717,359.07
5. Step 5: Solve for x
   x = 123,717,359.07/12,485.39
6. Step 6: Final answer
   x = 9,908.97