Finding the Fourth Proportional to 1,028.72, 1,419.56 and 603.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,028.72 : 1,419.56 = 603.40 : x
2. Step 2: Convert to fraction form
   1,028.72/1,419.56 = 603.40/x
3. Step 3: Cross multiply
   1,028.72x = 1,419.56 × 603.40
4. Step 4: Simplify right side
   1,028.72x = 856,562.50
5. Step 5: Solve for x
   x = 856,562.50/1,028.72
6. Step 6: Final answer
   x = 832.65