Finding the Fourth Proportional to 2,708.31, 3,738.78 and 2,109.63

Step by Step Solution

1. Step 1: Write the proportion equation
   2,708.31 : 3,738.78 = 2,109.63 : x
2. Step 2: Convert to fraction form
   2,708.31/3,738.78 = 2,109.63/x
3. Step 3: Cross multiply
   2,708.31x = 3,738.78 × 2,109.63
4. Step 4: Simplify right side
   2,708.31x = 7,887,442.45
5. Step 5: Solve for x
   x = 7,887,442.45/2,708.31
6. Step 6: Final answer
   x = 2,912.31