Finding the Fourth Proportional to 1,665.72, 2,298.84 and 1,105.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.72 : 2,298.84 = 1,105.20 : x
2. Step 2: Convert to fraction form
   1,665.72/2,298.84 = 1,105.20/x
3. Step 3: Cross multiply
   1,665.72x = 2,298.84 × 1,105.20
4. Step 4: Simplify right side
   1,665.72x = 2,540,677.97
5. Step 5: Solve for x
   x = 2,540,677.97/1,665.72
6. Step 6: Final answer
   x = 1,525.27