Finding the Fourth Proportional to 2,485.74, 3,730.17 and 1,390.83

Step by Step Solution

1. Step 1: Write the proportion equation
   2,485.74 : 3,730.17 = 1,390.83 : x
2. Step 2: Convert to fraction form
   2,485.74/3,730.17 = 1,390.83/x
3. Step 3: Cross multiply
   2,485.74x = 3,730.17 × 1,390.83
4. Step 4: Simplify right side
   2,485.74x = 5,188,032.34
5. Step 5: Solve for x
   x = 5,188,032.34/2,485.74
6. Step 6: Final answer
   x = 2,087.12