Finding the Fourth Proportional to 2,185.86, 3,016.56 and 1,399.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,185.86 : 3,016.56 = 1,399.50 : x
2. Step 2: Convert to fraction form
   2,185.86/3,016.56 = 1,399.50/x
3. Step 3: Cross multiply
   2,185.86x = 3,016.56 × 1,399.50
4. Step 4: Simplify right side
   2,185.86x = 4,221,675.72
5. Step 5: Solve for x
   x = 4,221,675.72/2,185.86
6. Step 6: Final answer
   x = 1,931.36