Finding the Fourth Proportional to 1,386.65, 1,913.58 and 797.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,386.65 : 1,913.58 = 797.30 : x
2. Step 2: Convert to fraction form
   1,386.65/1,913.58 = 797.30/x
3. Step 3: Cross multiply
   1,386.65x = 1,913.58 × 797.30
4. Step 4: Simplify right side
   1,386.65x = 1,525,697.33
5. Step 5: Solve for x
   x = 1,525,697.33/1,386.65
6. Step 6: Final answer
   x = 1,100.28