Finding the Fourth Proportional to 31,012.28, 42,808.08 and 18,437

Step by Step Solution

1. Step 1: Write the proportion equation
   31,012.28 : 42,808.08 = 18,437 : x
2. Step 2: Convert to fraction form
   31,012.28/42,808.08 = 18,437/x
3. Step 3: Cross multiply
   31,012.28x = 42,808.08 × 18,437
4. Step 4: Simplify right side
   31,012.28x = 789,252,570.96
5. Step 5: Solve for x
   x = 789,252,570.96/31,012.28
6. Step 6: Final answer
   x = 25,449.68