Finding the Fourth Proportional to 1,386.22, 1,912.28 and 796.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,386.22 : 1,912.28 = 796.40 : x
2. Step 2: Convert to fraction form
   1,386.22/1,912.28 = 796.40/x
3. Step 3: Cross multiply
   1,386.22x = 1,912.28 × 796.40
4. Step 4: Simplify right side
   1,386.22x = 1,522,939.79
5. Step 5: Solve for x
   x = 1,522,939.79/1,386.22
6. Step 6: Final answer
   x = 1,098.63