Finding the Fourth Proportional to 2,628.24, 3,942.83 and 1,312.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,628.24 : 3,942.83 = 1,312.12 : x
2. Step 2: Convert to fraction form
   2,628.24/3,942.83 = 1,312.12/x
3. Step 3: Cross multiply
   2,628.24x = 3,942.83 × 1,312.12
4. Step 4: Simplify right side
   2,628.24x = 5,173,466.10
5. Step 5: Solve for x
   x = 5,173,466.10/2,628.24
6. Step 6: Final answer
   x = 1,968.41