Finding the Fourth Proportional to 1,107.82, 1,662.42 and 621.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,107.82 : 1,662.42 = 621.20 : x
2. Step 2: Convert to fraction form
   1,107.82/1,662.42 = 621.20/x
3. Step 3: Cross multiply
   1,107.82x = 1,662.42 × 621.20
4. Step 4: Simplify right side
   1,107.82x = 1,032,695.30
5. Step 5: Solve for x
   x = 1,032,695.30/1,107.82
6. Step 6: Final answer
   x = 932.19