Finding the Fourth Proportional to 2,607.72, 3,912.03 and 853.14

Step by Step Solution

1. Step 1: Write the proportion equation
   2,607.72 : 3,912.03 = 853.14 : x
2. Step 2: Convert to fraction form
   2,607.72/3,912.03 = 853.14/x
3. Step 3: Cross multiply
   2,607.72x = 3,912.03 × 853.14
4. Step 4: Simplify right side
   2,607.72x = 3,337,509.27
5. Step 5: Solve for x
   x = 3,337,509.27/2,607.72
6. Step 6: Final answer
   x = 1,279.86