Finding the Fourth Proportional to 1,162.63, 1,604.37 and 638.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,162.63 : 1,604.37 = 638.56 : x
2. Step 2: Convert to fraction form
   1,162.63/1,604.37 = 638.56/x
3. Step 3: Cross multiply
   1,162.63x = 1,604.37 × 638.56
4. Step 4: Simplify right side
   1,162.63x = 1,024,486.51
5. Step 5: Solve for x
   x = 1,024,486.51/1,162.63
6. Step 6: Final answer
   x = 881.18