Finding the Fourth Proportional to 1,799.56, 2,697.72 and 644.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,799.56 : 2,697.72 = 644.50 : x
2. Step 2: Convert to fraction form
   1,799.56/2,697.72 = 644.50/x
3. Step 3: Cross multiply
   1,799.56x = 2,697.72 × 644.50
4. Step 4: Simplify right side
   1,799.56x = 1,738,680.54
5. Step 5: Solve for x
   x = 1,738,680.54/1,799.56
6. Step 6: Final answer
   x = 966.17