Finding the Fourth Proportional to 1,014.57, 1,399.37 and 641.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,014.57 : 1,399.37 = 641.61 : x
2. Step 2: Convert to fraction form
   1,014.57/1,399.37 = 641.61/x
3. Step 3: Cross multiply
   1,014.57x = 1,399.37 × 641.61
4. Step 4: Simplify right side
   1,014.57x = 897,846.58
5. Step 5: Solve for x
   x = 897,846.58/1,014.57
6. Step 6: Final answer
   x = 884.95