Finding the Fourth Proportional to 1,386.62, 1,913.56 and 797.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,386.62 : 1,913.56 = 797.22 : x
2. Step 2: Convert to fraction form
   1,386.62/1,913.56 = 797.22/x
3. Step 3: Cross multiply
   1,386.62x = 1,913.56 × 797.22
4. Step 4: Simplify right side
   1,386.62x = 1,525,528.30
5. Step 5: Solve for x
   x = 1,525,528.30/1,386.62
6. Step 6: Final answer
   x = 1,100.18