Finding the Fourth Proportional to 1,241.98, 1,713.83 and 718.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,241.98 : 1,713.83 = 718.05 : x
2. Step 2: Convert to fraction form
   1,241.98/1,713.83 = 718.05/x
3. Step 3: Cross multiply
   1,241.98x = 1,713.83 × 718.05
4. Step 4: Simplify right side
   1,241.98x = 1,230,615.63
5. Step 5: Solve for x
   x = 1,230,615.63/1,241.98
6. Step 6: Final answer
   x = 990.85