Finding the Fourth Proportional to 2,061.40, 3,091.02 and 828.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,061.40 : 3,091.02 = 828.76 : x
2. Step 2: Convert to fraction form
   2,061.40/3,091.02 = 828.76/x
3. Step 3: Cross multiply
   2,061.40x = 3,091.02 × 828.76
4. Step 4: Simplify right side
   2,061.40x = 2,561,713.74
5. Step 5: Solve for x
   x = 2,561,713.74/2,061.40
6. Step 6: Final answer
   x = 1,242.71