Finding the Fourth Proportional to 3,936.61, 5,904.55 and 1,200.61

Step by Step Solution

1. Step 1: Write the proportion equation
   3,936.61 : 5,904.55 = 1,200.61 : x
2. Step 2: Convert to fraction form
   3,936.61/5,904.55 = 1,200.61/x
3. Step 3: Cross multiply
   3,936.61x = 5,904.55 × 1,200.61
4. Step 4: Simplify right side
   3,936.61x = 7,089,061.78
5. Step 5: Solve for x
   x = 7,089,061.78/3,936.61
6. Step 6: Final answer
   x = 1,800.80