Finding the Fourth Proportional to 2,485.98, 3,727.34 and 1,390.46

Step by Step Solution

1. Step 1: Write the proportion equation
   2,485.98 : 3,727.34 = 1,390.46 : x
2. Step 2: Convert to fraction form
   2,485.98/3,727.34 = 1,390.46/x
3. Step 3: Cross multiply
   2,485.98x = 3,727.34 × 1,390.46
4. Step 4: Simplify right side
   2,485.98x = 5,182,717.18
5. Step 5: Solve for x
   x = 5,182,717.18/2,485.98
6. Step 6: Final answer
   x = 2,084.78