Finding the Fourth Proportional to 2,106.24, 3,158.52 and 644.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,106.24 : 3,158.52 = 644.88 : x
2. Step 2: Convert to fraction form
   2,106.24/3,158.52 = 644.88/x
3. Step 3: Cross multiply
   2,106.24x = 3,158.52 × 644.88
4. Step 4: Simplify right side
   2,106.24x = 2,036,866.38
5. Step 5: Solve for x
   x = 2,036,866.38/2,106.24
6. Step 6: Final answer
   x = 967.06