Finding the Fourth Proportional to 1,084.16, 1,495.94 and 642.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,084.16 : 1,495.94 = 642.15 : x
2. Step 2: Convert to fraction form
   1,084.16/1,495.94 = 642.15/x
3. Step 3: Cross multiply
   1,084.16x = 1,495.94 × 642.15
4. Step 4: Simplify right side
   1,084.16x = 960,614.66
5. Step 5: Solve for x
   x = 960,614.66/1,084.16
6. Step 6: Final answer
   x = 886.04