Finding the Fourth Proportional to 12,798.30, 17,661.42 and 7,209.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,798.30 : 17,661.42 = 7,209.30 : x
2. Step 2: Convert to fraction form
   12,798.30/17,661.42 = 7,209.30/x
3. Step 3: Cross multiply
   12,798.30x = 17,661.42 × 7,209.30
4. Step 4: Simplify right side
   12,798.30x = 127,326,475.21
5. Step 5: Solve for x
   x = 127,326,475.21/12,798.30
6. Step 6: Final answer
   x = 9,948.70