Finding the Fourth Proportional to 1,015.39, 1,401.33 and 721.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,015.39 : 1,401.33 = 721.99 : x
2. Step 2: Convert to fraction form
   1,015.39/1,401.33 = 721.99/x
3. Step 3: Cross multiply
   1,015.39x = 1,401.33 × 721.99
4. Step 4: Simplify right side
   1,015.39x = 1,011,746.25
5. Step 5: Solve for x
   x = 1,011,746.25/1,015.39
6. Step 6: Final answer
   x = 996.41