Finding the Fourth Proportional to 2,101.00, 3,151.49 and 640.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,101.00 : 3,151.49 = 640.15 : x
2. Step 2: Convert to fraction form
   2,101.00/3,151.49 = 640.15/x
3. Step 3: Cross multiply
   2,101.00x = 3,151.49 × 640.15
4. Step 4: Simplify right side
   2,101.00x = 2,017,427.15
5. Step 5: Solve for x
   x = 2,017,427.15/2,101.00
6. Step 6: Final answer
   x = 960.22