Finding the Fourth Proportional to 3,710.31, 5,120.79 and 2,116.95

Step by Step Solution

1. Step 1: Write the proportion equation
   3,710.31 : 5,120.79 = 2,116.95 : x
2. Step 2: Convert to fraction form
   3,710.31/5,120.79 = 2,116.95/x
3. Step 3: Cross multiply
   3,710.31x = 5,120.79 × 2,116.95
4. Step 4: Simplify right side
   3,710.31x = 10,840,456.39
5. Step 5: Solve for x
   x = 10,840,456.39/3,710.31
6. Step 6: Final answer
   x = 2,921.71