Finding the Fourth Proportional to 2,017.31, 3,024.84 and 921.07

Step by Step Solution

1. Step 1: Write the proportion equation
   2,017.31 : 3,024.84 = 921.07 : x
2. Step 2: Convert to fraction form
   2,017.31/3,024.84 = 921.07/x
3. Step 3: Cross multiply
   2,017.31x = 3,024.84 × 921.07
4. Step 4: Simplify right side
   2,017.31x = 2,786,096.61
5. Step 5: Solve for x
   x = 2,786,096.61/2,017.31
6. Step 6: Final answer
   x = 1,381.10