Finding the Fourth Proportional to 82,978.41, 124,468.07 and 20,648.91

Step by Step Solution

1. Step 1: Write the proportion equation
   82,978.41 : 124,468.07 = 20,648.91 : x
2. Step 2: Convert to fraction form
   82,978.41/124,468.07 = 20,648.91/x
3. Step 3: Cross multiply
   82,978.41x = 124,468.07 × 20,648.91
4. Step 4: Simplify right side
   82,978.41x = 2,570,129,872.06
5. Step 5: Solve for x
   x = 2,570,129,872.06/82,978.41
6. Step 6: Final answer
   x = 30,973.48