Finding the Fourth Proportional to 1,014.12, 1,399.55 and 621.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,014.12 : 1,399.55 = 621.27 : x
2. Step 2: Convert to fraction form
   1,014.12/1,399.55 = 621.27/x
3. Step 3: Cross multiply
   1,014.12x = 1,399.55 × 621.27
4. Step 4: Simplify right side
   1,014.12x = 869,495.32
5. Step 5: Solve for x
   x = 869,495.32/1,014.12
6. Step 6: Final answer
   x = 857.39