Finding the Fourth Proportional to 2,069.52, 3,103.60 and 770.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,069.52 : 3,103.60 = 770.80 : x
2. Step 2: Convert to fraction form
   2,069.52/3,103.60 = 770.80/x
3. Step 3: Cross multiply
   2,069.52x = 3,103.60 × 770.80
4. Step 4: Simplify right side
   2,069.52x = 2,392,254.88
5. Step 5: Solve for x
   x = 2,392,254.88/2,069.52
6. Step 6: Final answer
   x = 1,155.95