Finding the Fourth Proportional to 1,386.50, 1,913.37 and 797.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,386.50 : 1,913.37 = 797.10 : x
2. Step 2: Convert to fraction form
   1,386.50/1,913.37 = 797.10/x
3. Step 3: Cross multiply
   1,386.50x = 1,913.37 × 797.10
4. Step 4: Simplify right side
   1,386.50x = 1,525,147.23
5. Step 5: Solve for x
   x = 1,525,147.23/1,386.50
6. Step 6: Final answer
   x = 1,100.00