Finding the Fourth Proportional to 83,978.64, 125,969.85 and 31,359.42

Step by Step Solution

1. Step 1: Write the proportion equation
   83,978.64 : 125,969.85 = 31,359.42 : x
2. Step 2: Convert to fraction form
   83,978.64/125,969.85 = 31,359.42/x
3. Step 3: Cross multiply
   83,978.64x = 125,969.85 × 31,359.42
4. Step 4: Simplify right side
   83,978.64x = 3,950,341,433.49
5. Step 5: Solve for x
   x = 3,950,341,433.49/83,978.64
6. Step 6: Final answer
   x = 47,039.84