Finding the Fourth Proportional to 2,605.78, 3,905.58 and 1,372.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,605.78 : 3,905.58 = 1,372.56 : x
2. Step 2: Convert to fraction form
   2,605.78/3,905.58 = 1,372.56/x
3. Step 3: Cross multiply
   2,605.78x = 3,905.58 × 1,372.56
4. Step 4: Simplify right side
   2,605.78x = 5,360,642.88
5. Step 5: Solve for x
   x = 5,360,642.88/2,605.78
6. Step 6: Final answer
   x = 2,057.21