Finding the Fourth Proportional to 1,164.15, 1,606.56 and 721.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,164.15 : 1,606.56 = 721.89 : x
2. Step 2: Convert to fraction form
   1,164.15/1,606.56 = 721.89/x
3. Step 3: Cross multiply
   1,164.15x = 1,606.56 × 721.89
4. Step 4: Simplify right side
   1,164.15x = 1,159,759.60
5. Step 5: Solve for x
   x = 1,159,759.60/1,164.15
6. Step 6: Final answer
   x = 996.23