Finding the Fourth Proportional to 1,222.01, 1,686.36 and 662.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,222.01 : 1,686.36 = 662.47 : x
2. Step 2: Convert to fraction form
   1,222.01/1,686.36 = 662.47/x
3. Step 3: Cross multiply
   1,222.01x = 1,686.36 × 662.47
4. Step 4: Simplify right side
   1,222.01x = 1,117,160.33
5. Step 5: Solve for x
   x = 1,117,160.33/1,222.01
6. Step 6: Final answer
   x = 914.20