Finding the Fourth Proportional to 2,638.10, 3,957.42 and 906.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,638.10 : 3,957.42 = 906.50 : x
2. Step 2: Convert to fraction form
   2,638.10/3,957.42 = 906.50/x
3. Step 3: Cross multiply
   2,638.10x = 3,957.42 × 906.50
4. Step 4: Simplify right side
   2,638.10x = 3,587,401.23
5. Step 5: Solve for x
   x = 3,587,401.23/2,638.10
6. Step 6: Final answer
   x = 1,359.84