Finding the Fourth Proportional to 1,084.69, 1,496.55 and 642.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,084.69 : 1,496.55 = 642.43 : x
2. Step 2: Convert to fraction form
   1,084.69/1,496.55 = 642.43/x
3. Step 3: Cross multiply
   1,084.69x = 1,496.55 × 642.43
4. Step 4: Simplify right side
   1,084.69x = 961,428.62
5. Step 5: Solve for x
   x = 961,428.62/1,084.69
6. Step 6: Final answer
   x = 886.36