Finding the Fourth Proportional to 1,198.37, 1,797.86 and 613.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,198.37 : 1,797.86 = 613.15 : x
2. Step 2: Convert to fraction form
   1,198.37/1,797.86 = 613.15/x
3. Step 3: Cross multiply
   1,198.37x = 1,797.86 × 613.15
4. Step 4: Simplify right side
   1,198.37x = 1,102,357.86
5. Step 5: Solve for x
   x = 1,102,357.86/1,198.37
6. Step 6: Final answer
   x = 919.88