Finding the Fourth Proportional to 31,016.72, 42,802.76 and 16,869.57

Step by Step Solution

1. Step 1: Write the proportion equation
   31,016.72 : 42,802.76 = 16,869.57 : x
2. Step 2: Convert to fraction form
   31,016.72/42,802.76 = 16,869.57/x
3. Step 3: Cross multiply
   31,016.72x = 42,802.76 × 16,869.57
4. Step 4: Simplify right side
   31,016.72x = 722,064,037.68
5. Step 5: Solve for x
   x = 722,064,037.68/31,016.72
6. Step 6: Final answer
   x = 23,279.83