Finding the Fourth Proportional to 2,921.50, 4,371.31 and 1,820.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,921.50 : 4,371.31 = 1,820.71 : x
2. Step 2: Convert to fraction form
   2,921.50/4,371.31 = 1,820.71/x
3. Step 3: Cross multiply
   2,921.50x = 4,371.31 × 1,820.71
4. Step 4: Simplify right side
   2,921.50x = 7,958,887.83
5. Step 5: Solve for x
   x = 7,958,887.83/2,921.50
6. Step 6: Final answer
   x = 2,724.25