Finding the Fourth Proportional to 1,109.05, 1,662.49 and 531.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.05 : 1,662.49 = 531.61 : x
2. Step 2: Convert to fraction form
   1,109.05/1,662.49 = 531.61/x
3. Step 3: Cross multiply
   1,109.05x = 1,662.49 × 531.61
4. Step 4: Simplify right side
   1,109.05x = 883,796.31
5. Step 5: Solve for x
   x = 883,796.31/1,109.05
6. Step 6: Final answer
   x = 796.89