Finding the Fourth Proportional to 2,612.72, 3,920.64 and 1,381.04

Step by Step Solution

1. Step 1: Write the proportion equation
   2,612.72 : 3,920.64 = 1,381.04 : x
2. Step 2: Convert to fraction form
   2,612.72/3,920.64 = 1,381.04/x
3. Step 3: Cross multiply
   2,612.72x = 3,920.64 × 1,381.04
4. Step 4: Simplify right side
   2,612.72x = 5,414,560.67
5. Step 5: Solve for x
   x = 5,414,560.67/2,612.72
6. Step 6: Final answer
   x = 2,072.38