Finding the Fourth Proportional to 2,974.10, 4,457.91 and 2,105.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,974.10 : 4,457.91 = 2,105.78 : x
2. Step 2: Convert to fraction form
   2,974.10/4,457.91 = 2,105.78/x
3. Step 3: Cross multiply
   2,974.10x = 4,457.91 × 2,105.78
4. Step 4: Simplify right side
   2,974.10x = 9,387,377.72
5. Step 5: Solve for x
   x = 9,387,377.72/2,974.10
6. Step 6: Final answer
   x = 3,156.38