Finding the Fourth Proportional to 2,061.62, 3,091.67 and 828.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,061.62 : 3,091.67 = 828.70 : x
2. Step 2: Convert to fraction form
   2,061.62/3,091.67 = 828.70/x
3. Step 3: Cross multiply
   2,061.62x = 3,091.67 × 828.70
4. Step 4: Simplify right side
   2,061.62x = 2,562,066.93
5. Step 5: Solve for x
   x = 2,562,066.93/2,061.62
6. Step 6: Final answer
   x = 1,242.74