Finding the Fourth Proportional to 1,491.30, 2,058.05 and 828.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,491.30 : 2,058.05 = 828.15 : x
2. Step 2: Convert to fraction form
   1,491.30/2,058.05 = 828.15/x
3. Step 3: Cross multiply
   1,491.30x = 2,058.05 × 828.15
4. Step 4: Simplify right side
   1,491.30x = 1,704,374.11
5. Step 5: Solve for x
   x = 1,704,374.11/1,491.30
6. Step 6: Final answer
   x = 1,142.88