Finding the Fourth Proportional to 1,014.56, 1,399.73 and 641.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,014.56 : 1,399.73 = 641.42 : x
2. Step 2: Convert to fraction form
   1,014.56/1,399.73 = 641.42/x
3. Step 3: Cross multiply
   1,014.56x = 1,399.73 × 641.42
4. Step 4: Simplify right side
   1,014.56x = 897,814.82
5. Step 5: Solve for x
   x = 897,814.82/1,014.56
6. Step 6: Final answer
   x = 884.93