Finding the Fourth Proportional to 31,119.20, 42,942.82 and 17,688.60

Step by Step Solution

1. Step 1: Write the proportion equation
   31,119.20 : 42,942.82 = 17,688.60 : x
2. Step 2: Convert to fraction form
   31,119.20/42,942.82 = 17,688.60/x
3. Step 3: Cross multiply
   31,119.20x = 42,942.82 × 17,688.60
4. Step 4: Simplify right side
   31,119.20x = 759,598,365.85
5. Step 5: Solve for x
   x = 759,598,365.85/31,119.20
6. Step 6: Final answer
   x = 24,409.32