Finding the Fourth Proportional to 1,162.43, 1,604.15 and 638.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,162.43 : 1,604.15 = 638.46 : x
2. Step 2: Convert to fraction form
   1,162.43/1,604.15 = 638.46/x
3. Step 3: Cross multiply
   1,162.43x = 1,604.15 × 638.46
4. Step 4: Simplify right side
   1,162.43x = 1,024,191.41
5. Step 5: Solve for x
   x = 1,024,191.41/1,162.43
6. Step 6: Final answer
   x = 881.08