Finding the Fourth Proportional to 1,386.55, 1,913.50 and 797.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,386.55 : 1,913.50 = 797.28 : x
2. Step 2: Convert to fraction form
   1,386.55/1,913.50 = 797.28/x
3. Step 3: Cross multiply
   1,386.55x = 1,913.50 × 797.28
4. Step 4: Simplify right side
   1,386.55x = 1,525,595.28
5. Step 5: Solve for x
   x = 1,525,595.28/1,386.55
6. Step 6: Final answer
   x = 1,100.28