Finding the Fourth Proportional to 1,400.78, 1,932.72 and 811.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,400.78 : 1,932.72 = 811.10 : x
2. Step 2: Convert to fraction form
   1,400.78/1,932.72 = 811.10/x
3. Step 3: Cross multiply
   1,400.78x = 1,932.72 × 811.10
4. Step 4: Simplify right side
   1,400.78x = 1,567,629.19
5. Step 5: Solve for x
   x = 1,567,629.19/1,400.78
6. Step 6: Final answer
   x = 1,119.11