Finding the Fourth Proportional to 1,386.77, 1,913.67 and 797.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,386.77 : 1,913.67 = 797.31 : x
2. Step 2: Convert to fraction form
   1,386.77/1,913.67 = 797.31/x
3. Step 3: Cross multiply
   1,386.77x = 1,913.67 × 797.31
4. Step 4: Simplify right side
   1,386.77x = 1,525,788.23
5. Step 5: Solve for x
   x = 1,525,788.23/1,386.77
6. Step 6: Final answer
   x = 1,100.25