Finding the Fourth Proportional to 1,491.89, 2,058.73 and 828.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,491.89 : 2,058.73 = 828.70 : x
2. Step 2: Convert to fraction form
   1,491.89/2,058.73 = 828.70/x
3. Step 3: Cross multiply
   1,491.89x = 2,058.73 × 828.70
4. Step 4: Simplify right side
   1,491.89x = 1,706,065.41
5. Step 5: Solve for x
   x = 1,706,065.41/1,491.89
6. Step 6: Final answer
   x = 1,143.56