Finding the Fourth Proportional to 1,401.99, 1,934.73 and 812.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.99 : 1,934.73 = 812.31 : x
2. Step 2: Convert to fraction form
   1,401.99/1,934.73 = 812.31/x
3. Step 3: Cross multiply
   1,401.99x = 1,934.73 × 812.31
4. Step 4: Simplify right side
   1,401.99x = 1,571,600.53
5. Step 5: Solve for x
   x = 1,571,600.53/1,401.99
6. Step 6: Final answer
   x = 1,120.98