Finding the Fourth Proportional to 2,109.74, 3,164.58 and 648.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.74 : 3,164.58 = 648.87 : x
2. Step 2: Convert to fraction form
   2,109.74/3,164.58 = 648.87/x
3. Step 3: Cross multiply
   2,109.74x = 3,164.58 × 648.87
4. Step 4: Simplify right side
   2,109.74x = 2,053,401.02
5. Step 5: Solve for x
   x = 2,053,401.02/2,109.74
6. Step 6: Final answer
   x = 973.30