Finding the Fourth Proportional to 2,061.53, 3,091.89 and 828.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,061.53 : 3,091.89 = 828.31 : x
2. Step 2: Convert to fraction form
   2,061.53/3,091.89 = 828.31/x
3. Step 3: Cross multiply
   2,061.53x = 3,091.89 × 828.31
4. Step 4: Simplify right side
   2,061.53x = 2,561,027.95
5. Step 5: Solve for x
   x = 2,561,027.95/2,061.53
6. Step 6: Final answer
   x = 1,242.29