Finding the Fourth Proportional to 1,105.97, 1,525.97 and 810.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.97 : 1,525.97 = 810.72 : x
2. Step 2: Convert to fraction form
   1,105.97/1,525.97 = 810.72/x
3. Step 3: Cross multiply
   1,105.97x = 1,525.97 × 810.72
4. Step 4: Simplify right side
   1,105.97x = 1,237,136.43
5. Step 5: Solve for x
   x = 1,237,136.43/1,105.97
6. Step 6: Final answer
   x = 1,118.60