Finding the Fourth Proportional to 31,139.86, 42,961.77 and 23,971.97

Step by Step Solution

1. Step 1: Write the proportion equation
   31,139.86 : 42,961.77 = 23,971.97 : x
2. Step 2: Convert to fraction form
   31,139.86/42,961.77 = 23,971.97/x
3. Step 3: Cross multiply
   31,139.86x = 42,961.77 × 23,971.97
4. Step 4: Simplify right side
   31,139.86x = 1,029,878,046.78
5. Step 5: Solve for x
   x = 1,029,878,046.78/31,139.86
6. Step 6: Final answer
   x = 33,072.67