Finding the Fourth Proportional to 2,581.55, 3,872.30 and 938.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,581.55 : 3,872.30 = 938.09 : x
2. Step 2: Convert to fraction form
   2,581.55/3,872.30 = 938.09/x
3. Step 3: Cross multiply
   2,581.55x = 3,872.30 × 938.09
4. Step 4: Simplify right side
   2,581.55x = 3,632,541.86
5. Step 5: Solve for x
   x = 3,632,541.86/2,581.55
6. Step 6: Final answer
   x = 1,407.12