Finding the Fourth Proportional to 30,972.62, 42,759.94 and 20,393

Step by Step Solution

1. Step 1: Write the proportion equation
   30,972.62 : 42,759.94 = 20,393 : x
2. Step 2: Convert to fraction form
   30,972.62/42,759.94 = 20,393/x
3. Step 3: Cross multiply
   30,972.62x = 42,759.94 × 20,393
4. Step 4: Simplify right side
   30,972.62x = 872,003,456.42
5. Step 5: Solve for x
   x = 872,003,456.42/30,972.62
6. Step 6: Final answer
   x = 28,154.01