Finding the Fourth Proportional to 31,017.38, 42,804.18 and 16,870.32

Step by Step Solution

1. Step 1: Write the proportion equation
   31,017.38 : 42,804.18 = 16,870.32 : x
2. Step 2: Convert to fraction form
   31,017.38/42,804.18 = 16,870.32/x
3. Step 3: Cross multiply
   31,017.38x = 42,804.18 × 16,870.32
4. Step 4: Simplify right side
   31,017.38x = 722,120,213.94
5. Step 5: Solve for x
   x = 722,120,213.94/31,017.38
6. Step 6: Final answer
   x = 23,281.15