Finding the Fourth Proportional to 1,016.21, 1,400.37 and 720.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,016.21 : 1,400.37 = 720.96 : x
2. Step 2: Convert to fraction form
   1,016.21/1,400.37 = 720.96/x
3. Step 3: Cross multiply
   1,016.21x = 1,400.37 × 720.96
4. Step 4: Simplify right side
   1,016.21x = 1,009,610.76
5. Step 5: Solve for x
   x = 1,009,610.76/1,016.21
6. Step 6: Final answer
   x = 993.51