Finding the Fourth Proportional to 1,084.83, 1,496.58 and 642.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,084.83 : 1,496.58 = 642.48 : x
2. Step 2: Convert to fraction form
   1,084.83/1,496.58 = 642.48/x
3. Step 3: Cross multiply
   1,084.83x = 1,496.58 × 642.48
4. Step 4: Simplify right side
   1,084.83x = 961,522.72
5. Step 5: Solve for x
   x = 961,522.72/1,084.83
6. Step 6: Final answer
   x = 886.33