Finding the Fourth Proportional to 1,002.98, 1,504.42 and 272.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,002.98 : 1,504.42 = 272.61 : x
2. Step 2: Convert to fraction form
   1,002.98/1,504.42 = 272.61/x
3. Step 3: Cross multiply
   1,002.98x = 1,504.42 × 272.61
4. Step 4: Simplify right side
   1,002.98x = 410,119.25
5. Step 5: Solve for x
   x = 410,119.25/1,002.98
6. Step 6: Final answer
   x = 408.90