Finding the Fourth Proportional to 1,105.25, 1,525.25 and 1,012.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.25 : 1,525.25 = 1,012.31 : x
2. Step 2: Convert to fraction form
   1,105.25/1,525.25 = 1,012.31/x
3. Step 3: Cross multiply
   1,105.25x = 1,525.25 × 1,012.31
4. Step 4: Simplify right side
   1,105.25x = 1,544,025.83
5. Step 5: Solve for x
   x = 1,544,025.83/1,105.25
6. Step 6: Final answer
   x = 1,396.99