Finding the Fourth Proportional to 1,162.52, 1,604.32 and 638.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,162.52 : 1,604.32 = 638.56 : x
2. Step 2: Convert to fraction form
   1,162.52/1,604.32 = 638.56/x
3. Step 3: Cross multiply
   1,162.52x = 1,604.32 × 638.56
4. Step 4: Simplify right side
   1,162.52x = 1,024,454.58
5. Step 5: Solve for x
   x = 1,024,454.58/1,162.52
6. Step 6: Final answer
   x = 881.24