Finding the Fourth Proportional to 1,906.12, 2,630.52 and 1,439.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,906.12 : 2,630.52 = 1,439.56 : x
2. Step 2: Convert to fraction form
   1,906.12/2,630.52 = 1,439.56/x
3. Step 3: Cross multiply
   1,906.12x = 2,630.52 × 1,439.56
4. Step 4: Simplify right side
   1,906.12x = 3,786,791.37
5. Step 5: Solve for x
   x = 3,786,791.37/1,906.12
6. Step 6: Final answer
   x = 1,986.65