Finding the Fourth Proportional to 20,356.72, 28,092.42 and 12,397.48

Step by Step Solution

1. Step 1: Write the proportion equation
   20,356.72 : 28,092.42 = 12,397.48 : x
2. Step 2: Convert to fraction form
   20,356.72/28,092.42 = 12,397.48/x
3. Step 3: Cross multiply
   20,356.72x = 28,092.42 × 12,397.48
4. Step 4: Simplify right side
   20,356.72x = 348,275,215.10
5. Step 5: Solve for x
   x = 348,275,215.10/20,356.72
6. Step 6: Final answer
   x = 17,108.61