Finding the Fourth Proportional to 1,401.09, 1,933.62 and 811.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.09 : 1,933.62 = 811.83 : x
2. Step 2: Convert to fraction form
   1,401.09/1,933.62 = 811.83/x
3. Step 3: Cross multiply
   1,401.09x = 1,933.62 × 811.83
4. Step 4: Simplify right side
   1,401.09x = 1,569,770.72
5. Step 5: Solve for x
   x = 1,569,770.72/1,401.09
6. Step 6: Final answer
   x = 1,120.39