Finding the Fourth Proportional to 2,661, 3,992.14 and 1,200.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,661 : 3,992.14 = 1,200.15 : x
2. Step 2: Convert to fraction form
   2,661/3,992.14 = 1,200.15/x
3. Step 3: Cross multiply
   2,661x = 3,992.14 × 1,200.15
4. Step 4: Simplify right side
   2,661x = 4,791,166.82
5. Step 5: Solve for x
   x = 4,791,166.82/2,661
6. Step 6: Final answer
   x = 1,800.51