Finding the Fourth Proportional to 1,222.38, 1,686.86 and 662.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,222.38 : 1,686.86 = 662.83 : x
2. Step 2: Convert to fraction form
   1,222.38/1,686.86 = 662.83/x
3. Step 3: Cross multiply
   1,222.38x = 1,686.86 × 662.83
4. Step 4: Simplify right side
   1,222.38x = 1,118,096.37
5. Step 5: Solve for x
   x = 1,118,096.37/1,222.38
6. Step 6: Final answer
   x = 914.69