Finding the Fourth Proportional to 1,443.46, 1,991.89 and 814.13

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.46 : 1,991.89 = 814.13 : x
2. Step 2: Convert to fraction form
   1,443.46/1,991.89 = 814.13/x
3. Step 3: Cross multiply
   1,443.46x = 1,991.89 × 814.13
4. Step 4: Simplify right side
   1,443.46x = 1,621,657.41
5. Step 5: Solve for x
   x = 1,621,657.41/1,443.46
6. Step 6: Final answer
   x = 1,123.45