Finding the Fourth Proportional to 1,401.93, 1,934.78 and 812.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.93 : 1,934.78 = 812.48 : x
2. Step 2: Convert to fraction form
   1,401.93/1,934.78 = 812.48/x
3. Step 3: Cross multiply
   1,401.93x = 1,934.78 × 812.48
4. Step 4: Simplify right side
   1,401.93x = 1,571,956.32
5. Step 5: Solve for x
   x = 1,571,956.32/1,401.93
6. Step 6: Final answer
   x = 1,121.28