Finding the Fourth Proportional to 3,778.76, 5,215.01 and 2,100.12

Step by Step Solution

1. Step 1: Write the proportion equation
   3,778.76 : 5,215.01 = 2,100.12 : x
2. Step 2: Convert to fraction form
   3,778.76/5,215.01 = 2,100.12/x
3. Step 3: Cross multiply
   3,778.76x = 5,215.01 × 2,100.12
4. Step 4: Simplify right side
   3,778.76x = 10,952,148.32
5. Step 5: Solve for x
   x = 10,952,148.32/3,778.76
6. Step 6: Final answer
   x = 2,898.35