Finding the Fourth Proportional to 2,661.51, 3,991.72 and 713.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,661.51 : 3,991.72 = 713.25 : x
2. Step 2: Convert to fraction form
   2,661.51/3,991.72 = 713.25/x
3. Step 3: Cross multiply
   2,661.51x = 3,991.72 × 713.25
4. Step 4: Simplify right side
   2,661.51x = 2,847,102.49
5. Step 5: Solve for x
   x = 2,847,102.49/2,661.51
6. Step 6: Final answer
   x = 1,069.73