Finding the Fourth Proportional to 2,646.43, 3,968.73 and 1,085.99

Step by Step Solution

1. Step 1: Write the proportion equation
   2,646.43 : 3,968.73 = 1,085.99 : x
2. Step 2: Convert to fraction form
   2,646.43/3,968.73 = 1,085.99/x
3. Step 3: Cross multiply
   2,646.43x = 3,968.73 × 1,085.99
4. Step 4: Simplify right side
   2,646.43x = 4,309,995.66
5. Step 5: Solve for x
   x = 4,309,995.66/2,646.43
6. Step 6: Final answer
   x = 1,628.61