Finding the Fourth Proportional to 1,104.38, 1,524.24 and 638.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,104.38 : 1,524.24 = 638.63 : x
2. Step 2: Convert to fraction form
   1,104.38/1,524.24 = 638.63/x
3. Step 3: Cross multiply
   1,104.38x = 1,524.24 × 638.63
4. Step 4: Simplify right side
   1,104.38x = 973,417.77
5. Step 5: Solve for x
   x = 973,417.77/1,104.38
6. Step 6: Final answer
   x = 881.42