Finding the Fourth Proportional to 3,780.44, 5,216.71 and 2,101.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,780.44 : 5,216.71 = 2,101.72 : x
2. Step 2: Convert to fraction form
   3,780.44/5,216.71 = 2,101.72/x
3. Step 3: Cross multiply
   3,780.44x = 5,216.71 × 2,101.72
4. Step 4: Simplify right side
   3,780.44x = 10,964,027.15
5. Step 5: Solve for x
   x = 10,964,027.15/3,780.44
6. Step 6: Final answer
   x = 2,900.20