Finding the Fourth Proportional to 31,139.94, 42,974.03 and 16,993.70

Step by Step Solution

1. Step 1: Write the proportion equation
   31,139.94 : 42,974.03 = 16,993.70 : x
2. Step 2: Convert to fraction form
   31,139.94/42,974.03 = 16,993.70/x
3. Step 3: Cross multiply
   31,139.94x = 42,974.03 × 16,993.70
4. Step 4: Simplify right side
   31,139.94x = 730,287,473.77
5. Step 5: Solve for x
   x = 730,287,473.77/31,139.94
6. Step 6: Final answer
   x = 23,451.79