Finding the Fourth Proportional to 31,140.71, 42,974.34 and 16,993.86

Step by Step Solution

1. Step 1: Write the proportion equation
   31,140.71 : 42,974.34 = 16,993.86 : x
2. Step 2: Convert to fraction form
   31,140.71/42,974.34 = 16,993.86/x
3. Step 3: Cross multiply
   31,140.71x = 42,974.34 × 16,993.86
4. Step 4: Simplify right side
   31,140.71x = 730,299,917.55
5. Step 5: Solve for x
   x = 730,299,917.55/31,140.71
6. Step 6: Final answer
   x = 23,451.61