Finding the Fourth Proportional to 82,978.56, 124,467.86 and 20,649.06

Step by Step Solution

1. Step 1: Write the proportion equation
   82,978.56 : 124,467.86 = 20,649.06 : x
2. Step 2: Convert to fraction form
   82,978.56/124,467.86 = 20,649.06/x
3. Step 3: Cross multiply
   82,978.56x = 124,467.86 × 20,649.06
4. Step 4: Simplify right side
   82,978.56x = 2,570,144,309.21
5. Step 5: Solve for x
   x = 2,570,144,309.21/82,978.56
6. Step 6: Final answer
   x = 30,973.59