Finding the Fourth Proportional to 1,014.88, 1,400.56 and 621.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,014.88 : 1,400.56 = 621.83 : x
2. Step 2: Convert to fraction form
   1,014.88/1,400.56 = 621.83/x
3. Step 3: Cross multiply
   1,014.88x = 1,400.56 × 621.83
4. Step 4: Simplify right side
   1,014.88x = 870,903.22
5. Step 5: Solve for x
   x = 870,903.22/1,014.88
6. Step 6: Final answer
   x = 858.14