Finding the Fourth Proportional to 1,386.69, 1,913.99 and 797.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,386.69 : 1,913.99 = 797.28 : x
2. Step 2: Convert to fraction form
   1,386.69/1,913.99 = 797.28/x
3. Step 3: Cross multiply
   1,386.69x = 1,913.99 × 797.28
4. Step 4: Simplify right side
   1,386.69x = 1,525,981.96
5. Step 5: Solve for x
   x = 1,525,981.96/1,386.69
6. Step 6: Final answer
   x = 1,100.45