Finding the Fourth Proportional to 3,710.72, 5,120.88 and 2,138.96

Step by Step Solution

1. Step 1: Write the proportion equation
   3,710.72 : 5,120.88 = 2,138.96 : x
2. Step 2: Convert to fraction form
   3,710.72/5,120.88 = 2,138.96/x
3. Step 3: Cross multiply
   3,710.72x = 5,120.88 × 2,138.96
4. Step 4: Simplify right side
   3,710.72x = 10,953,357.48
5. Step 5: Solve for x
   x = 10,953,357.48/3,710.72
6. Step 6: Final answer
   x = 2,951.81