Finding the Fourth Proportional to 1,401.80, 1,934.24 and 812.23

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.80 : 1,934.24 = 812.23 : x
2. Step 2: Convert to fraction form
   1,401.80/1,934.24 = 812.23/x
3. Step 3: Cross multiply
   1,401.80x = 1,934.24 × 812.23
4. Step 4: Simplify right side
   1,401.80x = 1,571,047.76
5. Step 5: Solve for x
   x = 1,571,047.76/1,401.80
6. Step 6: Final answer
   x = 1,120.74