Finding the Fourth Proportional to 2,659.65, 3,991.37 and 1,200.03

Step by Step Solution

1. Step 1: Write the proportion equation
   2,659.65 : 3,991.37 = 1,200.03 : x
2. Step 2: Convert to fraction form
   2,659.65/3,991.37 = 1,200.03/x
3. Step 3: Cross multiply
   2,659.65x = 3,991.37 × 1,200.03
4. Step 4: Simplify right side
   2,659.65x = 4,789,757.74
5. Step 5: Solve for x
   x = 4,789,757.74/2,659.65
6. Step 6: Final answer
   x = 1,800.90