Finding the Fourth Proportional to 1,109.67, 1,662.57 and 720.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.67 : 1,662.57 = 720.06 : x
2. Step 2: Convert to fraction form
   1,109.67/1,662.57 = 720.06/x
3. Step 3: Cross multiply
   1,109.67x = 1,662.57 × 720.06
4. Step 4: Simplify right side
   1,109.67x = 1,197,150.15
5. Step 5: Solve for x
   x = 1,197,150.15/1,109.67
6. Step 6: Final answer
   x = 1,078.83