Finding the Fourth Proportional to 3,778.75, 5,215.50 and 2,100.73

Step by Step Solution

1. Step 1: Write the proportion equation
   3,778.75 : 5,215.50 = 2,100.73 : x
2. Step 2: Convert to fraction form
   3,778.75/5,215.50 = 2,100.73/x
3. Step 3: Cross multiply
   3,778.75x = 5,215.50 × 2,100.73
4. Step 4: Simplify right side
   3,778.75x = 10,956,357.32
5. Step 5: Solve for x
   x = 10,956,357.32/3,778.75
6. Step 6: Final answer
   x = 2,899.47