Finding the Fourth Proportional to 805.83, 1,111.89 and 681.22

Step by Step Solution

1. Step 1: Write the proportion equation
   805.83 : 1,111.89 = 681.22 : x
2. Step 2: Convert to fraction form
   805.83/1,111.89 = 681.22/x
3. Step 3: Cross multiply
   805.83x = 1,111.89 × 681.22
4. Step 4: Simplify right side
   805.83x = 757,441.71
5. Step 5: Solve for x
   x = 757,441.71/805.83
6. Step 6: Final answer
   x = 939.95