Finding the Fourth Proportional to 1,162.66, 1,604.49 and 638.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,162.66 : 1,604.49 = 638.69 : x
2. Step 2: Convert to fraction form
   1,162.66/1,604.49 = 638.69/x
3. Step 3: Cross multiply
   1,162.66x = 1,604.49 × 638.69
4. Step 4: Simplify right side
   1,162.66x = 1,024,771.72
5. Step 5: Solve for x
   x = 1,024,771.72/1,162.66
6. Step 6: Final answer
   x = 881.41