Finding the Fourth Proportional to 1,386.43, 1,913.60 and 797.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,386.43 : 1,913.60 = 797.31 : x
2. Step 2: Convert to fraction form
   1,386.43/1,913.60 = 797.31/x
3. Step 3: Cross multiply
   1,386.43x = 1,913.60 × 797.31
4. Step 4: Simplify right side
   1,386.43x = 1,525,722.85
5. Step 5: Solve for x
   x = 1,525,722.85/1,386.43
6. Step 6: Final answer
   x = 1,100.47