Finding the Fourth Proportional to 1,111.04, 1,665.24 and 699.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.04 : 1,665.24 = 699.20 : x
2. Step 2: Convert to fraction form
   1,111.04/1,665.24 = 699.20/x
3. Step 3: Cross multiply
   1,111.04x = 1,665.24 × 699.20
4. Step 4: Simplify right side
   1,111.04x = 1,164,335.81
5. Step 5: Solve for x
   x = 1,164,335.81/1,111.04
6. Step 6: Final answer
   x = 1,047.97