Finding the Fourth Proportional to 2,638.05, 3,953.43 and 2,559.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,638.05 : 3,953.43 = 2,559.21 : x
2. Step 2: Convert to fraction form
   2,638.05/3,953.43 = 2,559.21/x
3. Step 3: Cross multiply
   2,638.05x = 3,953.43 × 2,559.21
4. Step 4: Simplify right side
   2,638.05x = 10,117,657.59
5. Step 5: Solve for x
   x = 10,117,657.59/2,638.05
6. Step 6: Final answer
   x = 3,835.28