Finding the Fourth Proportional to 1,386.32, 1,912.88 and 796.64

Step by Step Solution

1. Step 1: Write the proportion equation
   1,386.32 : 1,912.88 = 796.64 : x
2. Step 2: Convert to fraction form
   1,386.32/1,912.88 = 796.64/x
3. Step 3: Cross multiply
   1,386.32x = 1,912.88 × 796.64
4. Step 4: Simplify right side
   1,386.32x = 1,523,876.72
5. Step 5: Solve for x
   x = 1,523,876.72/1,386.32
6. Step 6: Final answer
   x = 1,099.22