Finding the Fourth Proportional to 1,305.89, 1,802.25 and 716.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,305.89 : 1,802.25 = 716.54 : x
2. Step 2: Convert to fraction form
   1,305.89/1,802.25 = 716.54/x
3. Step 3: Cross multiply
   1,305.89x = 1,802.25 × 716.54
4. Step 4: Simplify right side
   1,305.89x = 1,291,380.63
5. Step 5: Solve for x
   x = 1,291,380.63/1,305.89
6. Step 6: Final answer
   x = 988.89