Finding the Fourth Proportional to 12,398.72, 17,108.16 and 7,430.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,398.72 : 17,108.16 = 7,430.72 : x
2. Step 2: Convert to fraction form
   12,398.72/17,108.16 = 7,430.72/x
3. Step 3: Cross multiply
   12,398.72x = 17,108.16 × 7,430.72
4. Step 4: Simplify right side
   12,398.72x = 127,125,946.68
5. Step 5: Solve for x
   x = 127,125,946.68/12,398.72
6. Step 6: Final answer
   x = 10,253.15