Finding the Fourth Proportional to 1,401.45, 1,933.22 and 811.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.45 : 1,933.22 = 811.91 : x
2. Step 2: Convert to fraction form
   1,401.45/1,933.22 = 811.91/x
3. Step 3: Cross multiply
   1,401.45x = 1,933.22 × 811.91
4. Step 4: Simplify right side
   1,401.45x = 1,569,586.92
5. Step 5: Solve for x
   x = 1,569,586.92/1,401.45
6. Step 6: Final answer
   x = 1,119.97