Finding the Fourth Proportional to 1,491.86, 2,058.68 and 828.68

Step by Step Solution

1. Step 1: Write the proportion equation
   1,491.86 : 2,058.68 = 828.68 : x
2. Step 2: Convert to fraction form
   1,491.86/2,058.68 = 828.68/x
3. Step 3: Cross multiply
   1,491.86x = 2,058.68 × 828.68
4. Step 4: Simplify right side
   1,491.86x = 1,705,978.72
5. Step 5: Solve for x
   x = 1,705,978.72/1,491.86
6. Step 6: Final answer
   x = 1,143.52