Finding the Fourth Proportional to 1,570.56, 2,165.12 and 1,103.36

Step by Step Solution

1. Step 1: Write the proportion equation
   1,570.56 : 2,165.12 = 1,103.36 : x
2. Step 2: Convert to fraction form
   1,570.56/2,165.12 = 1,103.36/x
3. Step 3: Cross multiply
   1,570.56x = 2,165.12 × 1,103.36
4. Step 4: Simplify right side
   1,570.56x = 2,388,906.80
5. Step 5: Solve for x
   x = 2,388,906.80/1,570.56
6. Step 6: Final answer
   x = 1,521.05