Finding the Fourth Proportional to 2,669.93, 4,005.41 and 820.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,669.93 : 4,005.41 = 820.72 : x
2. Step 2: Convert to fraction form
   2,669.93/4,005.41 = 820.72/x
3. Step 3: Cross multiply
   2,669.93x = 4,005.41 × 820.72
4. Step 4: Simplify right side
   2,669.93x = 3,287,320.10
5. Step 5: Solve for x
   x = 3,287,320.10/2,669.93
6. Step 6: Final answer
   x = 1,231.24