Finding the Fourth Proportional to 1,219.47, 1,682.55 and 721.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,219.47 : 1,682.55 = 721.89 : x
2. Step 2: Convert to fraction form
   1,219.47/1,682.55 = 721.89/x
3. Step 3: Cross multiply
   1,219.47x = 1,682.55 × 721.89
4. Step 4: Simplify right side
   1,219.47x = 1,214,616.02
5. Step 5: Solve for x
   x = 1,214,616.02/1,219.47
6. Step 6: Final answer
   x = 996.02