Finding the Fourth Proportional to 1,162.42, 1,604.12 and 638.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,162.42 : 1,604.12 = 638.45 : x
2. Step 2: Convert to fraction form
   1,162.42/1,604.12 = 638.45/x
3. Step 3: Cross multiply
   1,162.42x = 1,604.12 × 638.45
4. Step 4: Simplify right side
   1,162.42x = 1,024,150.41
5. Step 5: Solve for x
   x = 1,024,150.41/1,162.42
6. Step 6: Final answer
   x = 881.05