Finding the Fourth Proportional to 2,646.55, 3,969.86 and 1,085.47

Step by Step Solution

1. Step 1: Write the proportion equation
   2,646.55 : 3,969.86 = 1,085.47 : x
2. Step 2: Convert to fraction form
   2,646.55/3,969.86 = 1,085.47/x
3. Step 3: Cross multiply
   2,646.55x = 3,969.86 × 1,085.47
4. Step 4: Simplify right side
   2,646.55x = 4,309,163.93
5. Step 5: Solve for x
   x = 4,309,163.93/2,646.55
6. Step 6: Final answer
   x = 1,628.22