Finding the Fourth Proportional to 1,162.48, 1,604.32 and 638.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,162.48 : 1,604.32 = 638.61 : x
2. Step 2: Convert to fraction form
   1,162.48/1,604.32 = 638.61/x
3. Step 3: Cross multiply
   1,162.48x = 1,604.32 × 638.61
4. Step 4: Simplify right side
   1,162.48x = 1,024,532.59
5. Step 5: Solve for x
   x = 1,024,532.59/1,162.48
6. Step 6: Final answer
   x = 881.34