Finding the Fourth Proportional to 2,472.50, 3,708.78 and 648.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,472.50 : 3,708.78 = 648.50 : x
2. Step 2: Convert to fraction form
   2,472.50/3,708.78 = 648.50/x
3. Step 3: Cross multiply
   2,472.50x = 3,708.78 × 648.50
4. Step 4: Simplify right side
   2,472.50x = 2,405,143.83
5. Step 5: Solve for x
   x = 2,405,143.83/2,472.50
6. Step 6: Final answer
   x = 972.76