Finding the Fourth Proportional to 30,648.66, 42,314.72 and 20,454.23

Step by Step Solution

1. Step 1: Write the proportion equation
   30,648.66 : 42,314.72 = 20,454.23 : x
2. Step 2: Convert to fraction form
   30,648.66/42,314.72 = 20,454.23/x
3. Step 3: Cross multiply
   30,648.66x = 42,314.72 × 20,454.23
4. Step 4: Simplify right side
   30,648.66x = 865,514,701.42
5. Step 5: Solve for x
   x = 865,514,701.42/30,648.66
6. Step 6: Final answer
   x = 28,239.89