Finding the Fourth Proportional to 1,123.80, 1,685.10 and 604.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.80 : 1,685.10 = 604.10 : x
2. Step 2: Convert to fraction form
   1,123.80/1,685.10 = 604.10/x
3. Step 3: Cross multiply
   1,123.80x = 1,685.10 × 604.10
4. Step 4: Simplify right side
   1,123.80x = 1,017,968.91
5. Step 5: Solve for x
   x = 1,017,968.91/1,123.80
6. Step 6: Final answer
   x = 905.83