Finding the Fourth Proportional to 1,386.20, 1,912.37 and 796.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,386.20 : 1,912.37 = 796.61 : x
2. Step 2: Convert to fraction form
   1,386.20/1,912.37 = 796.61/x
3. Step 3: Cross multiply
   1,386.20x = 1,912.37 × 796.61
4. Step 4: Simplify right side
   1,386.20x = 1,523,413.86
5. Step 5: Solve for x
   x = 1,523,413.86/1,386.20
6. Step 6: Final answer
   x = 1,098.98