Finding the Fourth Proportional to 1,745.91, 2,619.63 and 820.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,745.91 : 2,619.63 = 820.83 : x
2. Step 2: Convert to fraction form
   1,745.91/2,619.63 = 820.83/x
3. Step 3: Cross multiply
   1,745.91x = 2,619.63 × 820.83
4. Step 4: Simplify right side
   1,745.91x = 2,150,270.89
5. Step 5: Solve for x
   x = 2,150,270.89/1,745.91
6. Step 6: Final answer
   x = 1,231.60