Finding the Fourth Proportional to 2,109.33, 3,163.37 and 648.45

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.33 : 3,163.37 = 648.45 : x
2. Step 2: Convert to fraction form
   2,109.33/3,163.37 = 648.45/x
3. Step 3: Cross multiply
   2,109.33x = 3,163.37 × 648.45
4. Step 4: Simplify right side
   2,109.33x = 2,051,284.03
5. Step 5: Solve for x
   x = 2,051,284.03/2,109.33
6. Step 6: Final answer
   x = 972.48