Finding the Fourth Proportional to 2,109.79, 3,164.41 and 648.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.79 : 3,164.41 = 648.91 : x
2. Step 2: Convert to fraction form
   2,109.79/3,164.41 = 648.91/x
3. Step 3: Cross multiply
   2,109.79x = 3,164.41 × 648.91
4. Step 4: Simplify right side
   2,109.79x = 2,053,398.23
5. Step 5: Solve for x
   x = 2,053,398.23/2,109.79
6. Step 6: Final answer
   x = 973.27