Finding the Fourth Proportional to 1,906.40, 2,630.94 and 1,067.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,906.40 : 2,630.94 = 1,067.12 : x
2. Step 2: Convert to fraction form
   1,906.40/2,630.94 = 1,067.12/x
3. Step 3: Cross multiply
   1,906.40x = 2,630.94 × 1,067.12
4. Step 4: Simplify right side
   1,906.40x = 2,807,528.69
5. Step 5: Solve for x
   x = 2,807,528.69/1,906.40
6. Step 6: Final answer
   x = 1,472.69