Finding the Fourth Proportional to 2,069.68, 3,105.20 and 771.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,069.68 : 3,105.20 = 771.25 : x
2. Step 2: Convert to fraction form
   2,069.68/3,105.20 = 771.25/x
3. Step 3: Cross multiply
   2,069.68x = 3,105.20 × 771.25
4. Step 4: Simplify right side
   2,069.68x = 2,394,885.50
5. Step 5: Solve for x
   x = 2,394,885.50/2,069.68
6. Step 6: Final answer
   x = 1,157.13