Finding the Fourth Proportional to 1,386.40, 1,913.43 and 796.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,386.40 : 1,913.43 = 796.92 : x
2. Step 2: Convert to fraction form
   1,386.40/1,913.43 = 796.92/x
3. Step 3: Cross multiply
   1,386.40x = 1,913.43 × 796.92
4. Step 4: Simplify right side
   1,386.40x = 1,524,851.43
5. Step 5: Solve for x
   x = 1,524,851.43/1,386.40
6. Step 6: Final answer
   x = 1,099.86