Finding the Fourth Proportional to 2,109.58, 3,164.37 and 648.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.58 : 3,164.37 = 648.72 : x
2. Step 2: Convert to fraction form
   2,109.58/3,164.37 = 648.72/x
3. Step 3: Cross multiply
   2,109.58x = 3,164.37 × 648.72
4. Step 4: Simplify right side
   2,109.58x = 2,052,771.04
5. Step 5: Solve for x
   x = 2,052,771.04/2,109.58
6. Step 6: Final answer
   x = 973.07