Finding the Fourth Proportional to 1,403.44, 1,936.68 and 813.68

Step by Step Solution

1. Step 1: Write the proportion equation
   1,403.44 : 1,936.68 = 813.68 : x
2. Step 2: Convert to fraction form
   1,403.44/1,936.68 = 813.68/x
3. Step 3: Cross multiply
   1,403.44x = 1,936.68 × 813.68
4. Step 4: Simplify right side
   1,403.44x = 1,575,837.78
5. Step 5: Solve for x
   x = 1,575,837.78/1,403.44
6. Step 6: Final answer
   x = 1,122.84