Finding the Fourth Proportional to 3,923.88, 5,886.72 and 1,326.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,923.88 : 5,886.72 = 1,326.78 : x
2. Step 2: Convert to fraction form
   3,923.88/5,886.72 = 1,326.78/x
3. Step 3: Cross multiply
   3,923.88x = 5,886.72 × 1,326.78
4. Step 4: Simplify right side
   3,923.88x = 7,810,382.36
5. Step 5: Solve for x
   x = 7,810,382.36/3,923.88
6. Step 6: Final answer
   x = 1,990.47