Finding the Fourth Proportional to 2,017.72, 3,025.36 and 921.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,017.72 : 3,025.36 = 921.05 : x
2. Step 2: Convert to fraction form
   2,017.72/3,025.36 = 921.05/x
3. Step 3: Cross multiply
   2,017.72x = 3,025.36 × 921.05
4. Step 4: Simplify right side
   2,017.72x = 2,786,507.83
5. Step 5: Solve for x
   x = 2,786,507.83/2,017.72
6. Step 6: Final answer
   x = 1,381.02