Finding the Fourth Proportional to 2,647.56, 3,969.78 and 1,186.44

Step by Step Solution

1. Step 1: Write the proportion equation
   2,647.56 : 3,969.78 = 1,186.44 : x
2. Step 2: Convert to fraction form
   2,647.56/3,969.78 = 1,186.44/x
3. Step 3: Cross multiply
   2,647.56x = 3,969.78 × 1,186.44
4. Step 4: Simplify right side
   2,647.56x = 4,709,905.78
5. Step 5: Solve for x
   x = 4,709,905.78/2,647.56
6. Step 6: Final answer
   x = 1,778.96