Finding the Fourth Proportional to 1,084.32, 1,496.32 and 642.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,084.32 : 1,496.32 = 642.28 : x
2. Step 2: Convert to fraction form
   1,084.32/1,496.32 = 642.28/x
3. Step 3: Cross multiply
   1,084.32x = 1,496.32 × 642.28
4. Step 4: Simplify right side
   1,084.32x = 961,056.41
5. Step 5: Solve for x
   x = 961,056.41/1,084.32
6. Step 6: Final answer
   x = 886.32