Finding the Fourth Proportional to 1,912.08, 2,638.50 and 1,061.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,912.08 : 2,638.50 = 1,061.28 : x
2. Step 2: Convert to fraction form
   1,912.08/2,638.50 = 1,061.28/x
3. Step 3: Cross multiply
   1,912.08x = 2,638.50 × 1,061.28
4. Step 4: Simplify right side
   1,912.08x = 2,800,187.28
5. Step 5: Solve for x
   x = 2,800,187.28/1,912.08
6. Step 6: Final answer
   x = 1,464.47