Finding the Fourth Proportional to 2,705.83, 4,057.51 and 2,620.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,705.83 : 4,057.51 = 2,620.78 : x
2. Step 2: Convert to fraction form
   2,705.83/4,057.51 = 2,620.78/x
3. Step 3: Cross multiply
   2,705.83x = 4,057.51 × 2,620.78
4. Step 4: Simplify right side
   2,705.83x = 10,633,841.06
5. Step 5: Solve for x
   x = 10,633,841.06/2,705.83
6. Step 6: Final answer
   x = 3,929.97