Finding the Fourth Proportional to 1,084.29, 1,496.27 and 642.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,084.29 : 1,496.27 = 642.03 : x
2. Step 2: Convert to fraction form
   1,084.29/1,496.27 = 642.03/x
3. Step 3: Cross multiply
   1,084.29x = 1,496.27 × 642.03
4. Step 4: Simplify right side
   1,084.29x = 960,646.22
5. Step 5: Solve for x
   x = 960,646.22/1,084.29
6. Step 6: Final answer
   x = 885.97