Finding the Fourth Proportional to 1,401.13, 1,933.34 and 811.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.13 : 1,933.34 = 811.55 : x
2. Step 2: Convert to fraction form
   1,401.13/1,933.34 = 811.55/x
3. Step 3: Cross multiply
   1,401.13x = 1,933.34 × 811.55
4. Step 4: Simplify right side
   1,401.13x = 1,568,991.98
5. Step 5: Solve for x
   x = 1,568,991.98/1,401.13
6. Step 6: Final answer
   x = 1,119.81