Finding the Fourth Proportional to 1,400.72, 1,932.86 and 811.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,400.72 : 1,932.86 = 811.45 : x
2. Step 2: Convert to fraction form
   1,400.72/1,932.86 = 811.45/x
3. Step 3: Cross multiply
   1,400.72x = 1,932.86 × 811.45
4. Step 4: Simplify right side
   1,400.72x = 1,568,405.53
5. Step 5: Solve for x
   x = 1,568,405.53/1,400.72
6. Step 6: Final answer
   x = 1,119.71