Finding the Fourth Proportional to 1,491.50, 2,058.39 and 828.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,491.50 : 2,058.39 = 828.56 : x
2. Step 2: Convert to fraction form
   1,491.50/2,058.39 = 828.56/x
3. Step 3: Cross multiply
   1,491.50x = 2,058.39 × 828.56
4. Step 4: Simplify right side
   1,491.50x = 1,705,504.76
5. Step 5: Solve for x
   x = 1,705,504.76/1,491.50
6. Step 6: Final answer
   x = 1,143.48