Finding the Fourth Proportional to 31,112.33, 42,937.56 and 17,687.79

Step by Step Solution

1. Step 1: Write the proportion equation
   31,112.33 : 42,937.56 = 17,687.79 : x
2. Step 2: Convert to fraction form
   31,112.33/42,937.56 = 17,687.79/x
3. Step 3: Cross multiply
   31,112.33x = 42,937.56 × 17,687.79
4. Step 4: Simplify right side
   31,112.33x = 759,470,544.39
5. Step 5: Solve for x
   x = 759,470,544.39/31,112.33
6. Step 6: Final answer
   x = 24,410.60