Finding the Fourth Proportional to 1,222.26, 1,686.71 and 662.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,222.26 : 1,686.71 = 662.72 : x
2. Step 2: Convert to fraction form
   1,222.26/1,686.71 = 662.72/x
3. Step 3: Cross multiply
   1,222.26x = 1,686.71 × 662.72
4. Step 4: Simplify right side
   1,222.26x = 1,117,817.35
5. Step 5: Solve for x
   x = 1,117,817.35/1,222.26
6. Step 6: Final answer
   x = 914.55