Finding the Fourth Proportional to 1,386.30, 1,913.42 and 797.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,386.30 : 1,913.42 = 797.18 : x
2. Step 2: Convert to fraction form
   1,386.30/1,913.42 = 797.18/x
3. Step 3: Cross multiply
   1,386.30x = 1,913.42 × 797.18
4. Step 4: Simplify right side
   1,386.30x = 1,525,326.60
5. Step 5: Solve for x
   x = 1,525,326.60/1,386.30
6. Step 6: Final answer
   x = 1,100.29