Finding the Fourth Proportional to 84,671.31, 126,990.76 and 42,539.72

Step by Step Solution

1. Step 1: Write the proportion equation
   84,671.31 : 126,990.76 = 42,539.72 : x
2. Step 2: Convert to fraction form
   84,671.31/126,990.76 = 42,539.72/x
3. Step 3: Cross multiply
   84,671.31x = 126,990.76 × 42,539.72
4. Step 4: Simplify right side
   84,671.31x = 5,402,150,738.03
5. Step 5: Solve for x
   x = 5,402,150,738.03/84,671.31
6. Step 6: Final answer
   x = 63,801.43