Finding the Fourth Proportional to 2,105.02, 3,155.67 and 805.63

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.02 : 3,155.67 = 805.63 : x
2. Step 2: Convert to fraction form
   2,105.02/3,155.67 = 805.63/x
3. Step 3: Cross multiply
   2,105.02x = 3,155.67 × 805.63
4. Step 4: Simplify right side
   2,105.02x = 2,542,302.42
5. Step 5: Solve for x
   x = 2,542,302.42/2,105.02
6. Step 6: Final answer
   x = 1,207.73