Finding the Fourth Proportional to 2,646.29, 3,967.27 and 1,328.45

Step by Step Solution

1. Step 1: Write the proportion equation
   2,646.29 : 3,967.27 = 1,328.45 : x
2. Step 2: Convert to fraction form
   2,646.29/3,967.27 = 1,328.45/x
3. Step 3: Cross multiply
   2,646.29x = 3,967.27 × 1,328.45
4. Step 4: Simplify right side
   2,646.29x = 5,270,326.43
5. Step 5: Solve for x
   x = 5,270,326.43/2,646.29
6. Step 6: Final answer
   x = 1,991.59