Finding the Fourth Proportional to 82,978.32, 124,468.34 and 20,648.82

Step by Step Solution

1. Step 1: Write the proportion equation
   82,978.32 : 124,468.34 = 20,648.82 : x
2. Step 2: Convert to fraction form
   82,978.32/124,468.34 = 20,648.82/x
3. Step 3: Cross multiply
   82,978.32x = 124,468.34 × 20,648.82
4. Step 4: Simplify right side
   82,978.32x = 2,570,124,245.11
5. Step 5: Solve for x
   x = 2,570,124,245.11/82,978.32
6. Step 6: Final answer
   x = 30,973.44