Finding the Fourth Proportional to 1,109.92, 1,662.72 and 724

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.92 : 1,662.72 = 724 : x
2. Step 2: Convert to fraction form
   1,109.92/1,662.72 = 724/x
3. Step 3: Cross multiply
   1,109.92x = 1,662.72 × 724
4. Step 4: Simplify right side
   1,109.92x = 1,203,809.28
5. Step 5: Solve for x
   x = 1,203,809.28/1,109.92
6. Step 6: Final answer
   x = 1,084.59