Finding the Fourth Proportional to 1,403.13, 1,936.35 and 805.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,403.13 : 1,936.35 = 805.72 : x
2. Step 2: Convert to fraction form
   1,403.13/1,936.35 = 805.72/x
3. Step 3: Cross multiply
   1,403.13x = 1,936.35 × 805.72
4. Step 4: Simplify right side
   1,403.13x = 1,560,157.89
5. Step 5: Solve for x
   x = 1,560,157.89/1,403.13
6. Step 6: Final answer
   x = 1,111.91