Finding the Fourth Proportional to 1,403.30, 1,936.56 and 813.95

Step by Step Solution

1. Step 1: Write the proportion equation
   1,403.30 : 1,936.56 = 813.95 : x
2. Step 2: Convert to fraction form
   1,403.30/1,936.56 = 813.95/x
3. Step 3: Cross multiply
   1,403.30x = 1,936.56 × 813.95
4. Step 4: Simplify right side
   1,403.30x = 1,576,263.01
5. Step 5: Solve for x
   x = 1,576,263.01/1,403.30
6. Step 6: Final answer
   x = 1,123.25