Finding the Fourth Proportional to 2,646.23, 3,969.22 and 1,085.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,646.23 : 3,969.22 = 1,085.72 : x
2. Step 2: Convert to fraction form
   2,646.23/3,969.22 = 1,085.72/x
3. Step 3: Cross multiply
   2,646.23x = 3,969.22 × 1,085.72
4. Step 4: Simplify right side
   2,646.23x = 4,309,461.54
5. Step 5: Solve for x
   x = 4,309,461.54/2,646.23
6. Step 6: Final answer
   x = 1,628.53