Finding the Fourth Proportional to 1,105.38, 1,523.61 and 810.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.38 : 1,523.61 = 810.54 : x
2. Step 2: Convert to fraction form
   1,105.38/1,523.61 = 810.54/x
3. Step 3: Cross multiply
   1,105.38x = 1,523.61 × 810.54
4. Step 4: Simplify right side
   1,105.38x = 1,234,946.85
5. Step 5: Solve for x
   x = 1,234,946.85/1,105.38
6. Step 6: Final answer
   x = 1,117.21