Finding the Fourth Proportional to 10,439.56, 15,659.31 and 2,648.35

Step by Step Solution

1. Step 1: Write the proportion equation
   10,439.56 : 15,659.31 = 2,648.35 : x
2. Step 2: Convert to fraction form
   10,439.56/15,659.31 = 2,648.35/x
3. Step 3: Cross multiply
   10,439.56x = 15,659.31 × 2,648.35
4. Step 4: Simplify right side
   10,439.56x = 41,471,333.64
5. Step 5: Solve for x
   x = 41,471,333.64/10,439.56
6. Step 6: Final answer
   x = 3,972.52