Finding the Fourth Proportional to 1,400.99, 1,933.35 and 811.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,400.99 : 1,933.35 = 811.31 : x
2. Step 2: Convert to fraction form
   1,400.99/1,933.35 = 811.31/x
3. Step 3: Cross multiply
   1,400.99x = 1,933.35 × 811.31
4. Step 4: Simplify right side
   1,400.99x = 1,568,546.19
5. Step 5: Solve for x
   x = 1,568,546.19/1,400.99
6. Step 6: Final answer
   x = 1,119.60