Finding the Fourth Proportional to 1,386.78, 1,913.74 and 797.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,386.78 : 1,913.74 = 797.27 : x
2. Step 2: Convert to fraction form
   1,386.78/1,913.74 = 797.27/x
3. Step 3: Cross multiply
   1,386.78x = 1,913.74 × 797.27
4. Step 4: Simplify right side
   1,386.78x = 1,525,767.49
5. Step 5: Solve for x
   x = 1,525,767.49/1,386.78
6. Step 6: Final answer
   x = 1,100.22