Finding the Fourth Proportional to 2,219.53, 3,329.67 and 921.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,219.53 : 3,329.67 = 921.10 : x
2. Step 2: Convert to fraction form
   2,219.53/3,329.67 = 921.10/x
3. Step 3: Cross multiply
   2,219.53x = 3,329.67 × 921.10
4. Step 4: Simplify right side
   2,219.53x = 3,066,959.04
5. Step 5: Solve for x
   x = 3,066,959.04/2,219.53
6. Step 6: Final answer
   x = 1,381.81