Finding the Fourth Proportional to 2,061.70, 3,089.85 and 828.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,061.70 : 3,089.85 = 828.10 : x
2. Step 2: Convert to fraction form
   2,061.70/3,089.85 = 828.10/x
3. Step 3: Cross multiply
   2,061.70x = 3,089.85 × 828.10
4. Step 4: Simplify right side
   2,061.70x = 2,558,704.79
5. Step 5: Solve for x
   x = 2,558,704.79/2,061.70
6. Step 6: Final answer
   x = 1,241.07