Finding the Fourth Proportional to 1,002.72, 1,503.96 and 272.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,002.72 : 1,503.96 = 272.35 : x
2. Step 2: Convert to fraction form
   1,002.72/1,503.96 = 272.35/x
3. Step 3: Cross multiply
   1,002.72x = 1,503.96 × 272.35
4. Step 4: Simplify right side
   1,002.72x = 409,603.51
5. Step 5: Solve for x
   x = 409,603.51/1,002.72
6. Step 6: Final answer
   x = 408.49