Finding the Fourth Proportional to 31,018.77, 42,805.71 and 16,871.67

Step by Step Solution

1. Step 1: Write the proportion equation
   31,018.77 : 42,805.71 = 16,871.67 : x
2. Step 2: Convert to fraction form
   31,018.77/42,805.71 = 16,871.67/x
3. Step 3: Cross multiply
   31,018.77x = 42,805.71 × 16,871.67
4. Step 4: Simplify right side
   31,018.77x = 722,203,813.24
5. Step 5: Solve for x
   x = 722,203,813.24/31,018.77
6. Step 6: Final answer
   x = 23,282.80