Finding the Fourth Proportional to 1,491.67, 2,058.56 and 828.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,491.67 : 2,058.56 = 828.58 : x
2. Step 2: Convert to fraction form
   1,491.67/2,058.56 = 828.58/x
3. Step 3: Cross multiply
   1,491.67x = 2,058.56 × 828.58
4. Step 4: Simplify right side
   1,491.67x = 1,705,683.72
5. Step 5: Solve for x
   x = 1,705,683.72/1,491.67
6. Step 6: Final answer
   x = 1,143.48