Finding the Fourth Proportional to 1,916.98, 2,644.56 and 1,581.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,916.98 : 2,644.56 = 1,581.10 : x
2. Step 2: Convert to fraction form
   1,916.98/2,644.56 = 1,581.10/x
3. Step 3: Cross multiply
   1,916.98x = 2,644.56 × 1,581.10
4. Step 4: Simplify right side
   1,916.98x = 4,181,313.82
5. Step 5: Solve for x
   x = 4,181,313.82/1,916.98
6. Step 6: Final answer
   x = 2,181.20