Finding the Fourth Proportional to 1,083.48, 1,495.31 and 641.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,083.48 : 1,495.31 = 641.42 : x
2. Step 2: Convert to fraction form
   1,083.48/1,495.31 = 641.42/x
3. Step 3: Cross multiply
   1,083.48x = 1,495.31 × 641.42
4. Step 4: Simplify right side
   1,083.48x = 959,120.27
5. Step 5: Solve for x
   x = 959,120.27/1,083.48
6. Step 6: Final answer
   x = 885.23