Finding the Fourth Proportional to 1,104.72, 1,657.41 and 642.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,104.72 : 1,657.41 = 642.42 : x
2. Step 2: Convert to fraction form
   1,104.72/1,657.41 = 642.42/x
3. Step 3: Cross multiply
   1,104.72x = 1,657.41 × 642.42
4. Step 4: Simplify right side
   1,104.72x = 1,064,753.33
5. Step 5: Solve for x
   x = 1,064,753.33/1,104.72
6. Step 6: Final answer
   x = 963.82