Finding the Fourth Proportional to 1,014.06, 1,399.50 and 641.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,014.06 : 1,399.50 = 641.06 : x
2. Step 2: Convert to fraction form
   1,014.06/1,399.50 = 641.06/x
3. Step 3: Cross multiply
   1,014.06x = 1,399.50 × 641.06
4. Step 4: Simplify right side
   1,014.06x = 897,156.47
5. Step 5: Solve for x
   x = 897,156.47/1,014.06
6. Step 6: Final answer
   x = 884.72