Finding the Fourth Proportional to 83,002.72, 124,440.28 and 42,978.80

Step by Step Solution

1. Step 1: Write the proportion equation
   83,002.72 : 124,440.28 = 42,978.80 : x
2. Step 2: Convert to fraction form
   83,002.72/124,440.28 = 42,978.80/x
3. Step 3: Cross multiply
   83,002.72x = 124,440.28 × 42,978.80
4. Step 4: Simplify right side
   83,002.72x = 5,348,293,906.06
5. Step 5: Solve for x
   x = 5,348,293,906.06/83,002.72
6. Step 6: Final answer
   x = 64,435.16