Finding the Fourth Proportional to 1,403.56, 1,936.68 and 813.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,403.56 : 1,936.68 = 813.99 : x
2. Step 2: Convert to fraction form
   1,403.56/1,936.68 = 813.99/x
3. Step 3: Cross multiply
   1,403.56x = 1,936.68 × 813.99
4. Step 4: Simplify right side
   1,403.56x = 1,576,438.15
5. Step 5: Solve for x
   x = 1,576,438.15/1,403.56
6. Step 6: Final answer
   x = 1,123.17