Finding the Fourth Proportional to 1,045.90, 1,443.31 and 603.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,045.90 : 1,443.31 = 603.78 : x
2. Step 2: Convert to fraction form
   1,045.90/1,443.31 = 603.78/x
3. Step 3: Cross multiply
   1,045.90x = 1,443.31 × 603.78
4. Step 4: Simplify right side
   1,045.90x = 871,441.71
5. Step 5: Solve for x
   x = 871,441.71/1,045.90
6. Step 6: Final answer
   x = 833.20