Finding the Fourth Proportional to 3,778.79, 5,214.56 and 2,100.17

Step by Step Solution

1. Step 1: Write the proportion equation
   3,778.79 : 5,214.56 = 2,100.17 : x
2. Step 2: Convert to fraction form
   3,778.79/5,214.56 = 2,100.17/x
3. Step 3: Cross multiply
   3,778.79x = 5,214.56 × 2,100.17
4. Step 4: Simplify right side
   3,778.79x = 10,951,480.76
5. Step 5: Solve for x
   x = 10,951,480.76/3,778.79
6. Step 6: Final answer
   x = 2,898.15