Finding the Fourth Proportional to 31,017.12, 42,802.38 and 16,869.96

Step by Step Solution

1. Step 1: Write the proportion equation
   31,017.12 : 42,802.38 = 16,869.96 : x
2. Step 2: Convert to fraction form
   31,017.12/42,802.38 = 16,869.96/x
3. Step 3: Cross multiply
   31,017.12x = 42,802.38 × 16,869.96
4. Step 4: Simplify right side
   31,017.12x = 722,074,438.50
5. Step 5: Solve for x
   x = 722,074,438.50/31,017.12
6. Step 6: Final answer
   x = 23,279.87