Finding the Fourth Proportional to 1,091.83, 1,638.89 and 681.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,091.83 : 1,638.89 = 681.25 : x
2. Step 2: Convert to fraction form
   1,091.83/1,638.89 = 681.25/x
3. Step 3: Cross multiply
   1,091.83x = 1,638.89 × 681.25
4. Step 4: Simplify right side
   1,091.83x = 1,116,493.81
5. Step 5: Solve for x
   x = 1,116,493.81/1,091.83
6. Step 6: Final answer
   x = 1,022.59