Finding the Fourth Proportional to 1,403.55, 1,936.83 and 813.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,403.55 : 1,936.83 = 813.99 : x
2. Step 2: Convert to fraction form
   1,403.55/1,936.83 = 813.99/x
3. Step 3: Cross multiply
   1,403.55x = 1,936.83 × 813.99
4. Step 4: Simplify right side
   1,403.55x = 1,576,560.25
5. Step 5: Solve for x
   x = 1,576,560.25/1,403.55
6. Step 6: Final answer
   x = 1,123.27