Finding the Fourth Proportional to 1,014.59, 1,398.94 and 621.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,014.59 : 1,398.94 = 621.27 : x
2. Step 2: Convert to fraction form
   1,014.59/1,398.94 = 621.27/x
3. Step 3: Cross multiply
   1,014.59x = 1,398.94 × 621.27
4. Step 4: Simplify right side
   1,014.59x = 869,117.90
5. Step 5: Solve for x
   x = 869,117.90/1,014.59
6. Step 6: Final answer
   x = 856.62