Finding the Fourth Proportional to 1,386.28, 1,913.39 and 797.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,386.28 : 1,913.39 = 797.15 : x
2. Step 2: Convert to fraction form
   1,386.28/1,913.39 = 797.15/x
3. Step 3: Cross multiply
   1,386.28x = 1,913.39 × 797.15
4. Step 4: Simplify right side
   1,386.28x = 1,525,262.63
5. Step 5: Solve for x
   x = 1,525,262.63/1,386.28
6. Step 6: Final answer
   x = 1,100.26