Finding the Fourth Proportional to 1,162.53, 1,604.28 and 638.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,162.53 : 1,604.28 = 638.56 : x
2. Step 2: Convert to fraction form
   1,162.53/1,604.28 = 638.56/x
3. Step 3: Cross multiply
   1,162.53x = 1,604.28 × 638.56
4. Step 4: Simplify right side
   1,162.53x = 1,024,425.03
5. Step 5: Solve for x
   x = 1,024,425.03/1,162.53
6. Step 6: Final answer
   x = 881.20