Finding the Fourth Proportional to 2,109.57, 3,164.54 and 648.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.57 : 3,164.54 = 648.87 : x
2. Step 2: Convert to fraction form
   2,109.57/3,164.54 = 648.87/x
3. Step 3: Cross multiply
   2,109.57x = 3,164.54 × 648.87
4. Step 4: Simplify right side
   2,109.57x = 2,053,371.83
5. Step 5: Solve for x
   x = 2,053,371.83/2,109.57
6. Step 6: Final answer
   x = 973.36