Finding the Fourth Proportional to 1,109.05, 1,520.56 and 1,089.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.05 : 1,520.56 = 1,089.29 : x
2. Step 2: Convert to fraction form
   1,109.05/1,520.56 = 1,089.29/x
3. Step 3: Cross multiply
   1,109.05x = 1,520.56 × 1,089.29
4. Step 4: Simplify right side
   1,109.05x = 1,656,335.97
5. Step 5: Solve for x
   x = 1,656,335.97/1,109.05
6. Step 6: Final answer
   x = 1,493.48