Finding the Fourth Proportional to 2,381.56, 3,571.46 and 921.22

Step by Step Solution

1. Step 1: Write the proportion equation
   2,381.56 : 3,571.46 = 921.22 : x
2. Step 2: Convert to fraction form
   2,381.56/3,571.46 = 921.22/x
3. Step 3: Cross multiply
   2,381.56x = 3,571.46 × 921.22
4. Step 4: Simplify right side
   2,381.56x = 3,290,100.38
5. Step 5: Solve for x
   x = 3,290,100.38/2,381.56
6. Step 6: Final answer
   x = 1,381.49