Finding the Fourth Proportional to 31,118.42, 42,948.21 and 18,372.96

Step by Step Solution

1. Step 1: Write the proportion equation
   31,118.42 : 42,948.21 = 18,372.96 : x
2. Step 2: Convert to fraction form
   31,118.42/42,948.21 = 18,372.96/x
3. Step 3: Cross multiply
   31,118.42x = 42,948.21 × 18,372.96
4. Step 4: Simplify right side
   31,118.42x = 789,085,744.40
5. Step 5: Solve for x
   x = 789,085,744.40/31,118.42
6. Step 6: Final answer
   x = 25,357.52