Finding the Fourth Proportional to 31,017.87, 42,804.78 and 16,870.71

Step by Step Solution

1. Step 1: Write the proportion equation
   31,017.87 : 42,804.78 = 16,870.71 : x
2. Step 2: Convert to fraction form
   31,017.87/42,804.78 = 16,870.71/x
3. Step 3: Cross multiply
   31,017.87x = 42,804.78 × 16,870.71
4. Step 4: Simplify right side
   31,017.87x = 722,147,029.99
5. Step 5: Solve for x
   x = 722,147,029.99/31,017.87
6. Step 6: Final answer
   x = 23,281.64