Finding the Fourth Proportional to 82,870.22, 124,306.59 and 20,540.78

Step by Step Solution

1. Step 1: Write the proportion equation
   82,870.22 : 124,306.59 = 20,540.78 : x
2. Step 2: Convert to fraction form
   82,870.22/124,306.59 = 20,540.78/x
3. Step 3: Cross multiply
   82,870.22x = 124,306.59 × 20,540.78
4. Step 4: Simplify right side
   82,870.22x = 2,553,354,317.74
5. Step 5: Solve for x
   x = 2,553,354,317.74/82,870.22
6. Step 6: Final answer
   x = 30,811.48