Finding the Fourth Proportional to 3,878.40, 5,811.39 and 3,775.89

Step by Step Solution

1. Step 1: Write the proportion equation
   3,878.40 : 5,811.39 = 3,775.89 : x
2. Step 2: Convert to fraction form
   3,878.40/5,811.39 = 3,775.89/x
3. Step 3: Cross multiply
   3,878.40x = 5,811.39 × 3,775.89
4. Step 4: Simplify right side
   3,878.40x = 21,943,169.39
5. Step 5: Solve for x
   x = 21,943,169.39/3,878.40
6. Step 6: Final answer
   x = 5,657.79