Finding the Fourth Proportional to 2,086.85, 3,129.18 and 770.26

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.85 : 3,129.18 = 770.26 : x
2. Step 2: Convert to fraction form
   2,086.85/3,129.18 = 770.26/x
3. Step 3: Cross multiply
   2,086.85x = 3,129.18 × 770.26
4. Step 4: Simplify right side
   2,086.85x = 2,410,282.19
5. Step 5: Solve for x
   x = 2,410,282.19/2,086.85
6. Step 6: Final answer
   x = 1,154.99