Finding the Fourth Proportional to 2,219.32, 3,329.39 and 920.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,219.32 : 3,329.39 = 920.89 : x
2. Step 2: Convert to fraction form
   2,219.32/3,329.39 = 920.89/x
3. Step 3: Cross multiply
   2,219.32x = 3,329.39 × 920.89
4. Step 4: Simplify right side
   2,219.32x = 3,066,001.96
5. Step 5: Solve for x
   x = 3,066,001.96/2,219.32
6. Step 6: Final answer
   x = 1,381.51