Finding the Fourth Proportional to 82,021.12, 122,987.92 and 42,480.16

Step by Step Solution

1. Step 1: Write the proportion equation
   82,021.12 : 122,987.92 = 42,480.16 : x
2. Step 2: Convert to fraction form
   82,021.12/122,987.92 = 42,480.16/x
3. Step 3: Cross multiply
   82,021.12x = 122,987.92 × 42,480.16
4. Step 4: Simplify right side
   82,021.12x = 5,224,546,519.67
5. Step 5: Solve for x
   x = 5,224,546,519.67/82,021.12
6. Step 6: Final answer
   x = 63,697.58