Finding the Fourth Proportional to 1,084.72, 1,496.81 and 642.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,084.72 : 1,496.81 = 642.54 : x
2. Step 2: Convert to fraction form
   1,084.72/1,496.81 = 642.54/x
3. Step 3: Cross multiply
   1,084.72x = 1,496.81 × 642.54
4. Step 4: Simplify right side
   1,084.72x = 961,760.30
5. Step 5: Solve for x
   x = 961,760.30/1,084.72
6. Step 6: Final answer
   x = 886.64