Finding the Fourth Proportional to 1,063.68, 1,468.16 and 644.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,063.68 : 1,468.16 = 644.05 : x
2. Step 2: Convert to fraction form
   1,063.68/1,468.16 = 644.05/x
3. Step 3: Cross multiply
   1,063.68x = 1,468.16 × 644.05
4. Step 4: Simplify right side
   1,063.68x = 945,568.45
5. Step 5: Solve for x
   x = 945,568.45/1,063.68
6. Step 6: Final answer
   x = 888.96