Finding the Fourth Proportional to 31,086.74, 42,899.52 and 16,939.54

Step by Step Solution

1. Step 1: Write the proportion equation
   31,086.74 : 42,899.52 = 16,939.54 : x
2. Step 2: Convert to fraction form
   31,086.74/42,899.52 = 16,939.54/x
3. Step 3: Cross multiply
   31,086.74x = 42,899.52 × 16,939.54
4. Step 4: Simplify right side
   31,086.74x = 726,698,135.02
5. Step 5: Solve for x
   x = 726,698,135.02/31,086.74
6. Step 6: Final answer
   x = 23,376.47