Finding the Fourth Proportional to 31,112.58, 42,934.42 and 17,685.30

Step by Step Solution

1. Step 1: Write the proportion equation
   31,112.58 : 42,934.42 = 17,685.30 : x
2. Step 2: Convert to fraction form
   31,112.58/42,934.42 = 17,685.30/x
3. Step 3: Cross multiply
   31,112.58x = 42,934.42 × 17,685.30
4. Step 4: Simplify right side
   31,112.58x = 759,308,098.03
5. Step 5: Solve for x
   x = 759,308,098.03/31,112.58
6. Step 6: Final answer
   x = 24,405.18