Finding the Fourth Proportional to 2,485.71, 3,730.14 and 1,390.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,485.71 : 3,730.14 = 1,390.79 : x
2. Step 2: Convert to fraction form
   2,485.71/3,730.14 = 1,390.79/x
3. Step 3: Cross multiply
   2,485.71x = 3,730.14 × 1,390.79
4. Step 4: Simplify right side
   2,485.71x = 5,187,834.46
5. Step 5: Solve for x
   x = 5,187,834.46/2,485.71
6. Step 6: Final answer
   x = 2,087.06