Finding the Fourth Proportional to 2,086.39, 3,129.90 and 769.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.39 : 3,129.90 = 769.94 : x
2. Step 2: Convert to fraction form
   2,086.39/3,129.90 = 769.94/x
3. Step 3: Cross multiply
   2,086.39x = 3,129.90 × 769.94
4. Step 4: Simplify right side
   2,086.39x = 2,409,815.71
5. Step 5: Solve for x
   x = 2,409,815.71/2,086.39
6. Step 6: Final answer
   x = 1,155.02