Finding the Fourth Proportional to 2,605, 3,905.86 and 1,123.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,605 : 3,905.86 = 1,123.42 : x
2. Step 2: Convert to fraction form
   2,605/3,905.86 = 1,123.42/x
3. Step 3: Cross multiply
   2,605x = 3,905.86 × 1,123.42
4. Step 4: Simplify right side
   2,605x = 4,387,921.24
5. Step 5: Solve for x
   x = 4,387,921.24/2,605
6. Step 6: Final answer
   x = 1,684.42