Finding the Fourth Proportional to 1,401.66, 1,934.64 and 812.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.66 : 1,934.64 = 812.55 : x
2. Step 2: Convert to fraction form
   1,401.66/1,934.64 = 812.55/x
3. Step 3: Cross multiply
   1,401.66x = 1,934.64 × 812.55
4. Step 4: Simplify right side
   1,401.66x = 1,571,991.73
5. Step 5: Solve for x
   x = 1,571,991.73/1,401.66
6. Step 6: Final answer
   x = 1,121.52