Finding the Fourth Proportional to 2,086.04, 3,128.64 and 770.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.04 : 3,128.64 = 770.60 : x
2. Step 2: Convert to fraction form
   2,086.04/3,128.64 = 770.60/x
3. Step 3: Cross multiply
   2,086.04x = 3,128.64 × 770.60
4. Step 4: Simplify right side
   2,086.04x = 2,410,929.98
5. Step 5: Solve for x
   x = 2,410,929.98/2,086.04
6. Step 6: Final answer
   x = 1,155.74