Finding the Fourth Proportional to 1,108.88, 1,662.24 and 415.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,108.88 : 1,662.24 = 415.37 : x
2. Step 2: Convert to fraction form
   1,108.88/1,662.24 = 415.37/x
3. Step 3: Cross multiply
   1,108.88x = 1,662.24 × 415.37
4. Step 4: Simplify right side
   1,108.88x = 690,436.32
5. Step 5: Solve for x
   x = 690,436.32/1,108.88
6. Step 6: Final answer
   x = 622.65