Finding the Fourth Proportional to 1,083.38, 1,494.79 and 641.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,083.38 : 1,494.79 = 641.42 : x
2. Step 2: Convert to fraction form
   1,083.38/1,494.79 = 641.42/x
3. Step 3: Cross multiply
   1,083.38x = 1,494.79 × 641.42
4. Step 4: Simplify right side
   1,083.38x = 958,788.20
5. Step 5: Solve for x
   x = 958,788.20/1,083.38
6. Step 6: Final answer
   x = 885.00