Finding the Fourth Proportional to 82,978.71, 124,468.52 and 20,649.21

Step by Step Solution

1. Step 1: Write the proportion equation
   82,978.71 : 124,468.52 = 20,649.21 : x
2. Step 2: Convert to fraction form
   82,978.71/124,468.52 = 20,649.21/x
3. Step 3: Cross multiply
   82,978.71x = 124,468.52 × 20,649.21
4. Step 4: Simplify right side
   82,978.71x = 2,570,176,504.62
5. Step 5: Solve for x
   x = 2,570,176,504.62/82,978.71
6. Step 6: Final answer
   x = 30,973.93