Finding the Fourth Proportional to 2,061.20, 3,092.24 and 828.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,061.20 : 3,092.24 = 828.40 : x
2. Step 2: Convert to fraction form
   2,061.20/3,092.24 = 828.40/x
3. Step 3: Cross multiply
   2,061.20x = 3,092.24 × 828.40
4. Step 4: Simplify right side
   2,061.20x = 2,561,611.62
5. Step 5: Solve for x
   x = 2,561,611.62/2,061.20
6. Step 6: Final answer
   x = 1,242.78