Finding the Fourth Proportional to 1,386.75, 1,913.72 and 797.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,386.75 : 1,913.72 = 797.32 : x
2. Step 2: Convert to fraction form
   1,386.75/1,913.72 = 797.32/x
3. Step 3: Cross multiply
   1,386.75x = 1,913.72 × 797.32
4. Step 4: Simplify right side
   1,386.75x = 1,525,847.23
5. Step 5: Solve for x
   x = 1,525,847.23/1,386.75
6. Step 6: Final answer
   x = 1,100.30