Finding the Fourth Proportional to 2,109.44, 3,164.16 and 648.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.44 : 3,164.16 = 648.56 : x
2. Step 2: Convert to fraction form
   2,109.44/3,164.16 = 648.56/x
3. Step 3: Cross multiply
   2,109.44x = 3,164.16 × 648.56
4. Step 4: Simplify right side
   2,109.44x = 2,052,147.61
5. Step 5: Solve for x
   x = 2,052,147.61/2,109.44
6. Step 6: Final answer
   x = 972.84