Finding the Fourth Proportional to 1,403.60, 1,936.91 and 814.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,403.60 : 1,936.91 = 814.05 : x
2. Step 2: Convert to fraction form
   1,403.60/1,936.91 = 814.05/x
3. Step 3: Cross multiply
   1,403.60x = 1,936.91 × 814.05
4. Step 4: Simplify right side
   1,403.60x = 1,576,743.62
5. Step 5: Solve for x
   x = 1,576,743.62/1,403.60
6. Step 6: Final answer
   x = 1,123.36