Finding the Fourth Proportional to 1,327.52, 1,991.39 and 403.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,327.52 : 1,991.39 = 403.31 : x
2. Step 2: Convert to fraction form
   1,327.52/1,991.39 = 403.31/x
3. Step 3: Cross multiply
   1,327.52x = 1,991.39 × 403.31
4. Step 4: Simplify right side
   1,327.52x = 803,150.46
5. Step 5: Solve for x
   x = 803,150.46/1,327.52
6. Step 6: Final answer
   x = 605.00