Finding the Fourth Proportional to 2,109.48, 3,163.50 and 648.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.48 : 3,163.50 = 648.72 : x
2. Step 2: Convert to fraction form
   2,109.48/3,163.50 = 648.72/x
3. Step 3: Cross multiply
   2,109.48x = 3,163.50 × 648.72
4. Step 4: Simplify right side
   2,109.48x = 2,052,225.72
5. Step 5: Solve for x
   x = 2,052,225.72/2,109.48
6. Step 6: Final answer
   x = 972.86