Finding the Fourth Proportional to 1,617.33, 2,231.72 and 988.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,617.33 : 2,231.72 = 988.01 : x
2. Step 2: Convert to fraction form
   1,617.33/2,231.72 = 988.01/x
3. Step 3: Cross multiply
   1,617.33x = 2,231.72 × 988.01
4. Step 4: Simplify right side
   1,617.33x = 2,204,945.58
5. Step 5: Solve for x
   x = 2,204,945.58/1,617.33
6. Step 6: Final answer
   x = 1,363.32