Finding the Fourth Proportional to 2,604.78, 3,905.99 and 1,123.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,604.78 : 3,905.99 = 1,123.30 : x
2. Step 2: Convert to fraction form
   2,604.78/3,905.99 = 1,123.30/x
3. Step 3: Cross multiply
   2,604.78x = 3,905.99 × 1,123.30
4. Step 4: Simplify right side
   2,604.78x = 4,387,598.80
5. Step 5: Solve for x
   x = 4,387,598.80/2,604.78
6. Step 6: Final answer
   x = 1,684.44