Finding the Fourth Proportional to 2,105.27, 3,157.91 and 807.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.27 : 3,157.91 = 807.05 : x
2. Step 2: Convert to fraction form
   2,105.27/3,157.91 = 807.05/x
3. Step 3: Cross multiply
   2,105.27x = 3,157.91 × 807.05
4. Step 4: Simplify right side
   2,105.27x = 2,548,591.27
5. Step 5: Solve for x
   x = 2,548,591.27/2,105.27
6. Step 6: Final answer
   x = 1,210.58