Finding the Fourth Proportional to 31,017.79, 42,805.47 and 16,871.59

Step by Step Solution

1. Step 1: Write the proportion equation
   31,017.79 : 42,805.47 = 16,871.59 : x
2. Step 2: Convert to fraction form
   31,017.79/42,805.47 = 16,871.59/x
3. Step 3: Cross multiply
   31,017.79x = 42,805.47 × 16,871.59
4. Step 4: Simplify right side
   31,017.79x = 722,196,339.60
5. Step 5: Solve for x
   x = 722,196,339.60/31,017.79
6. Step 6: Final answer
   x = 23,283.29