Finding the Fourth Proportional to 31,085.61, 42,898.46 and 16,938.69

Step by Step Solution

1. Step 1: Write the proportion equation
   31,085.61 : 42,898.46 = 16,938.69 : x
2. Step 2: Convert to fraction form
   31,085.61/42,898.46 = 16,938.69/x
3. Step 3: Cross multiply
   31,085.61x = 42,898.46 × 16,938.69
4. Step 4: Simplify right side
   31,085.61x = 726,643,630.72
5. Step 5: Solve for x
   x = 726,643,630.72/31,085.61
6. Step 6: Final answer
   x = 23,375.56