Finding the Fourth Proportional to 31,018.87, 42,806.10 and 16,871.68

Step by Step Solution

1. Step 1: Write the proportion equation
   31,018.87 : 42,806.10 = 16,871.68 : x
2. Step 2: Convert to fraction form
   31,018.87/42,806.10 = 16,871.68/x
3. Step 3: Cross multiply
   31,018.87x = 42,806.10 × 16,871.68
4. Step 4: Simplify right side
   31,018.87x = 722,210,821.25
5. Step 5: Solve for x
   x = 722,210,821.25/31,018.87
6. Step 6: Final answer
   x = 23,282.95