Finding the Fourth Proportional to 3,875.26, 5,810.45 and 2,638.90

Step by Step Solution

1. Step 1: Write the proportion equation
   3,875.26 : 5,810.45 = 2,638.90 : x
2. Step 2: Convert to fraction form
   3,875.26/5,810.45 = 2,638.90/x
3. Step 3: Cross multiply
   3,875.26x = 5,810.45 × 2,638.90
4. Step 4: Simplify right side
   3,875.26x = 15,333,196.51
5. Step 5: Solve for x
   x = 15,333,196.51/3,875.26
6. Step 6: Final answer
   x = 3,956.69