Finding the Fourth Proportional to 2,005.20, 3,002.13 and 1,272.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,005.20 : 3,002.13 = 1,272.96 : x
2. Step 2: Convert to fraction form
   2,005.20/3,002.13 = 1,272.96/x
3. Step 3: Cross multiply
   2,005.20x = 3,002.13 × 1,272.96
4. Step 4: Simplify right side
   2,005.20x = 3,821,591.40
5. Step 5: Solve for x
   x = 3,821,591.40/2,005.20
6. Step 6: Final answer
   x = 1,905.84