Finding the Fourth Proportional to 31,086.42, 42,913.67 and 18,335.31

Step by Step Solution

1. Step 1: Write the proportion equation
   31,086.42 : 42,913.67 = 18,335.31 : x
2. Step 2: Convert to fraction form
   31,086.42/42,913.67 = 18,335.31/x
3. Step 3: Cross multiply
   31,086.42x = 42,913.67 × 18,335.31
4. Step 4: Simplify right side
   31,086.42x = 786,835,351.01
5. Step 5: Solve for x
   x = 786,835,351.01/31,086.42
6. Step 6: Final answer
   x = 25,311.22