Finding the Fourth Proportional to 1,401.49, 1,933.70 and 811.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.49 : 1,933.70 = 811.67 : x
2. Step 2: Convert to fraction form
   1,401.49/1,933.70 = 811.67/x
3. Step 3: Cross multiply
   1,401.49x = 1,933.70 × 811.67
4. Step 4: Simplify right side
   1,401.49x = 1,569,527.05
5. Step 5: Solve for x
   x = 1,569,527.05/1,401.49
6. Step 6: Final answer
   x = 1,119.90