Finding the Fourth Proportional to 2,219.50, 3,327.43 and 921.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,219.50 : 3,327.43 = 921.90 : x
2. Step 2: Convert to fraction form
   2,219.50/3,327.43 = 921.90/x
3. Step 3: Cross multiply
   2,219.50x = 3,327.43 × 921.90
4. Step 4: Simplify right side
   2,219.50x = 3,067,557.72
5. Step 5: Solve for x
   x = 3,067,557.72/2,219.50
6. Step 6: Final answer
   x = 1,382.09