Finding the Fourth Proportional to 1,327.34, 1,990.34 and 402.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,327.34 : 1,990.34 = 402.72 : x
2. Step 2: Convert to fraction form
   1,327.34/1,990.34 = 402.72/x
3. Step 3: Cross multiply
   1,327.34x = 1,990.34 × 402.72
4. Step 4: Simplify right side
   1,327.34x = 801,549.72
5. Step 5: Solve for x
   x = 801,549.72/1,327.34
6. Step 6: Final answer
   x = 603.88