Finding the Fourth Proportional to 1,222.06, 1,686.43 and 662.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,222.06 : 1,686.43 = 662.53 : x
2. Step 2: Convert to fraction form
   1,222.06/1,686.43 = 662.53/x
3. Step 3: Cross multiply
   1,222.06x = 1,686.43 × 662.53
4. Step 4: Simplify right side
   1,222.06x = 1,117,310.47
5. Step 5: Solve for x
   x = 1,117,310.47/1,222.06
6. Step 6: Final answer
   x = 914.28