Finding the Fourth Proportional to 2,647.38, 3,971.49 and 1,086.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,647.38 : 3,971.49 = 1,086.96 : x
2. Step 2: Convert to fraction form
   2,647.38/3,971.49 = 1,086.96/x
3. Step 3: Cross multiply
   2,647.38x = 3,971.49 × 1,086.96
4. Step 4: Simplify right side
   2,647.38x = 4,316,850.77
5. Step 5: Solve for x
   x = 4,316,850.77/2,647.38
6. Step 6: Final answer
   x = 1,630.62