Finding the Fourth Proportional to 1,443.31, 1,991.77 and 814.00

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.31 : 1,991.77 = 814.00 : x
2. Step 2: Convert to fraction form
   1,443.31/1,991.77 = 814.00/x
3. Step 3: Cross multiply
   1,443.31x = 1,991.77 × 814.00
4. Step 4: Simplify right side
   1,443.31x = 1,621,290.82
5. Step 5: Solve for x
   x = 1,621,290.82/1,443.31
6. Step 6: Final answer
   x = 1,123.31