Finding the Fourth Proportional to 1,084.70, 1,496.18 and 642.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,084.70 : 1,496.18 = 642.27 : x
2. Step 2: Convert to fraction form
   1,084.70/1,496.18 = 642.27/x
3. Step 3: Cross multiply
   1,084.70x = 1,496.18 × 642.27
4. Step 4: Simplify right side
   1,084.70x = 960,948.32
5. Step 5: Solve for x
   x = 960,948.32/1,084.70
6. Step 6: Final answer
   x = 885.92