Finding the Fourth Proportional to 2,106.52, 3,159.82 and 645.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,106.52 : 3,159.82 = 645.69 : x
2. Step 2: Convert to fraction form
   2,106.52/3,159.82 = 645.69/x
3. Step 3: Cross multiply
   2,106.52x = 3,159.82 × 645.69
4. Step 4: Simplify right side
   2,106.52x = 2,040,257.24
5. Step 5: Solve for x
   x = 2,040,257.24/2,106.52
6. Step 6: Final answer
   x = 968.54