Finding the Fourth Proportional to 1,162.47, 1,604.16 and 638.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,162.47 : 1,604.16 = 638.49 : x
2. Step 2: Convert to fraction form
   1,162.47/1,604.16 = 638.49/x
3. Step 3: Cross multiply
   1,162.47x = 1,604.16 × 638.49
4. Step 4: Simplify right side
   1,162.47x = 1,024,240.12
5. Step 5: Solve for x
   x = 1,024,240.12/1,162.47
6. Step 6: Final answer
   x = 881.09