Finding the Fourth Proportional to 1,162.76, 1,604.48 and 638.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,162.76 : 1,604.48 = 638.69 : x
2. Step 2: Convert to fraction form
   1,162.76/1,604.48 = 638.69/x
3. Step 3: Cross multiply
   1,162.76x = 1,604.48 × 638.69
4. Step 4: Simplify right side
   1,162.76x = 1,024,754.12
5. Step 5: Solve for x
   x = 1,024,754.12/1,162.76
6. Step 6: Final answer
   x = 881.32