Finding the Fourth Proportional to 1,109.18, 1,662.64 and 719.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.18 : 1,662.64 = 719.42 : x
2. Step 2: Convert to fraction form
   1,109.18/1,662.64 = 719.42/x
3. Step 3: Cross multiply
   1,109.18x = 1,662.64 × 719.42
4. Step 4: Simplify right side
   1,109.18x = 1,196,138.83
5. Step 5: Solve for x
   x = 1,196,138.83/1,109.18
6. Step 6: Final answer
   x = 1,078.40