Finding the Fourth Proportional to 868.67, 1,196.42 and 647.22

Step by Step Solution

1. Step 1: Write the proportion equation
   868.67 : 1,196.42 = 647.22 : x
2. Step 2: Convert to fraction form
   868.67/1,196.42 = 647.22/x
3. Step 3: Cross multiply
   868.67x = 1,196.42 × 647.22
4. Step 4: Simplify right side
   868.67x = 774,343.72
5. Step 5: Solve for x
   x = 774,343.72/868.67
6. Step 6: Final answer
   x = 891.42