Finding the Fourth Proportional to 1,017.07, 1,399.91 and 721.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,017.07 : 1,399.91 = 721.83 : x
2. Step 2: Convert to fraction form
   1,017.07/1,399.91 = 721.83/x
3. Step 3: Cross multiply
   1,017.07x = 1,399.91 × 721.83
4. Step 4: Simplify right side
   1,017.07x = 1,010,486.43
5. Step 5: Solve for x
   x = 1,010,486.43/1,017.07
6. Step 6: Final answer
   x = 993.53