Finding the Fourth Proportional to 1,113.20, 1,659.24 and 1,105.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,113.20 : 1,659.24 = 1,105.10 : x
2. Step 2: Convert to fraction form
   1,113.20/1,659.24 = 1,105.10/x
3. Step 3: Cross multiply
   1,113.20x = 1,659.24 × 1,105.10
4. Step 4: Simplify right side
   1,113.20x = 1,833,626.12
5. Step 5: Solve for x
   x = 1,833,626.12/1,113.20
6. Step 6: Final answer
   x = 1,647.17