Finding the Fourth Proportional to 1,441.57, 1,989.37 and 812.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,441.57 : 1,989.37 = 812.12 : x
2. Step 2: Convert to fraction form
   1,441.57/1,989.37 = 812.12/x
3. Step 3: Cross multiply
   1,441.57x = 1,989.37 × 812.12
4. Step 4: Simplify right side
   1,441.57x = 1,615,603.10
5. Step 5: Solve for x
   x = 1,615,603.10/1,441.57
6. Step 6: Final answer
   x = 1,120.73