Finding the Fourth Proportional to 1,945.72, 2,921.46 and 1,916.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,945.72 : 2,921.46 = 1,916.92 : x
2. Step 2: Convert to fraction form
   1,945.72/2,921.46 = 1,916.92/x
3. Step 3: Cross multiply
   1,945.72x = 2,921.46 × 1,916.92
4. Step 4: Simplify right side
   1,945.72x = 5,600,205.10
5. Step 5: Solve for x
   x = 5,600,205.10/1,945.72
6. Step 6: Final answer
   x = 2,878.22