Finding the Fourth Proportional to 2,439.79, 3,660.50 and 774.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,439.79 : 3,660.50 = 774.18 : x
2. Step 2: Convert to fraction form
   2,439.79/3,660.50 = 774.18/x
3. Step 3: Cross multiply
   2,439.79x = 3,660.50 × 774.18
4. Step 4: Simplify right side
   2,439.79x = 2,833,885.89
5. Step 5: Solve for x
   x = 2,833,885.89/2,439.79
6. Step 6: Final answer
   x = 1,161.53