Finding the Fourth Proportional to 2,031.60, 3,045.30 and 1,105.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,031.60 : 3,045.30 = 1,105.20 : x
2. Step 2: Convert to fraction form
   2,031.60/3,045.30 = 1,105.20/x
3. Step 3: Cross multiply
   2,031.60x = 3,045.30 × 1,105.20
4. Step 4: Simplify right side
   2,031.60x = 3,365,665.56
5. Step 5: Solve for x
   x = 3,365,665.56/2,031.60
6. Step 6: Final answer
   x = 1,656.66