Finding the Fourth Proportional to 1,109.89, 1,662.13 and 1,080.73

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.89 : 1,662.13 = 1,080.73 : x
2. Step 2: Convert to fraction form
   1,109.89/1,662.13 = 1,080.73/x
3. Step 3: Cross multiply
   1,109.89x = 1,662.13 × 1,080.73
4. Step 4: Simplify right side
   1,109.89x = 1,796,313.75
5. Step 5: Solve for x
   x = 1,796,313.75/1,109.89
6. Step 6: Final answer
   x = 1,618.46