Finding the Fourth Proportional to 1,086.72, 1,619 and 1,033.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.72 : 1,619 = 1,033.40 : x
2. Step 2: Convert to fraction form
   1,086.72/1,619 = 1,033.40/x
3. Step 3: Cross multiply
   1,086.72x = 1,619 × 1,033.40
4. Step 4: Simplify right side
   1,086.72x = 1,673,074.60
5. Step 5: Solve for x
   x = 1,673,074.60/1,086.72
6. Step 6: Final answer
   x = 1,539.56