Finding the Fourth Proportional to 1,084.55, 1,496.44 and 642.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,084.55 : 1,496.44 = 642.59 : x
2. Step 2: Convert to fraction form
   1,084.55/1,496.44 = 642.59/x
3. Step 3: Cross multiply
   1,084.55x = 1,496.44 × 642.59
4. Step 4: Simplify right side
   1,084.55x = 961,596.31
5. Step 5: Solve for x
   x = 961,596.31/1,084.55
6. Step 6: Final answer
   x = 886.64