Finding the Fourth Proportional to 2,106.45, 3,160.17 and 645.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,106.45 : 3,160.17 = 645.59 : x
2. Step 2: Convert to fraction form
   2,106.45/3,160.17 = 645.59/x
3. Step 3: Cross multiply
   2,106.45x = 3,160.17 × 645.59
4. Step 4: Simplify right side
   2,106.45x = 2,040,174.15
5. Step 5: Solve for x
   x = 2,040,174.15/2,106.45
6. Step 6: Final answer
   x = 968.54