Finding the Fourth Proportional to 1,162.56, 1,604.37 and 638.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,162.56 : 1,604.37 = 638.63 : x
2. Step 2: Convert to fraction form
   1,162.56/1,604.37 = 638.63/x
3. Step 3: Cross multiply
   1,162.56x = 1,604.37 × 638.63
4. Step 4: Simplify right side
   1,162.56x = 1,024,598.81
5. Step 5: Solve for x
   x = 1,024,598.81/1,162.56
6. Step 6: Final answer
   x = 881.33