Finding the Fourth Proportional to 1,105.70, 1,525.59 and 712.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.70 : 1,525.59 = 712.25 : x
2. Step 2: Convert to fraction form
   1,105.70/1,525.59 = 712.25/x
3. Step 3: Cross multiply
   1,105.70x = 1,525.59 × 712.25
4. Step 4: Simplify right side
   1,105.70x = 1,086,601.48
5. Step 5: Solve for x
   x = 1,086,601.48/1,105.70
6. Step 6: Final answer
   x = 982.73