Finding the Fourth Proportional to 1,912.78, 2,846.30 and 1,906.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,912.78 : 2,846.30 = 1,906.30 : x
2. Step 2: Convert to fraction form
   1,912.78/2,846.30 = 1,906.30/x
3. Step 3: Cross multiply
   1,912.78x = 2,846.30 × 1,906.30
4. Step 4: Simplify right side
   1,912.78x = 5,425,901.69
5. Step 5: Solve for x
   x = 5,425,901.69/1,912.78
6. Step 6: Final answer
   x = 2,836.66