Finding the Fourth Proportional to 31,012.84, 42,797.88 and 16,865.70

Step by Step Solution

1. Step 1: Write the proportion equation
   31,012.84 : 42,797.88 = 16,865.70 : x
2. Step 2: Convert to fraction form
   31,012.84/42,797.88 = 16,865.70/x
3. Step 3: Cross multiply
   31,012.84x = 42,797.88 × 16,865.70
4. Step 4: Simplify right side
   31,012.84x = 721,816,204.72
5. Step 5: Solve for x
   x = 721,816,204.72/31,012.84
6. Step 6: Final answer
   x = 23,274.75