Finding the Fourth Proportional to 1,386.63, 1,913.40 and 797.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,386.63 : 1,913.40 = 797.25 : x
2. Step 2: Convert to fraction form
   1,386.63/1,913.40 = 797.25/x
3. Step 3: Cross multiply
   1,386.63x = 1,913.40 × 797.25
4. Step 4: Simplify right side
   1,386.63x = 1,525,458.15
5. Step 5: Solve for x
   x = 1,525,458.15/1,386.63
6. Step 6: Final answer
   x = 1,100.12