Finding the Fourth Proportional to 31,115.84, 42,938.16 and 17,685.23

Step by Step Solution

1. Step 1: Write the proportion equation
   31,115.84 : 42,938.16 = 17,685.23 : x
2. Step 2: Convert to fraction form
   31,115.84/42,938.16 = 17,685.23/x
3. Step 3: Cross multiply
   31,115.84x = 42,938.16 × 17,685.23
4. Step 4: Simplify right side
   31,115.84x = 759,371,020.69
5. Step 5: Solve for x
   x = 759,371,020.69/31,115.84
6. Step 6: Final answer
   x = 24,404.65