Finding the Fourth Proportional to 2,219.82, 3,329.58 and 921.24

Step by Step Solution

1. Step 1: Write the proportion equation
   2,219.82 : 3,329.58 = 921.24 : x
2. Step 2: Convert to fraction form
   2,219.82/3,329.58 = 921.24/x
3. Step 3: Cross multiply
   2,219.82x = 3,329.58 × 921.24
4. Step 4: Simplify right side
   2,219.82x = 3,067,342.28
5. Step 5: Solve for x
   x = 3,067,342.28/2,219.82
6. Step 6: Final answer
   x = 1,381.80