Finding the Fourth Proportional to 8,622.89, 12,936.50 and 2,779.37

Step by Step Solution

1. Step 1: Write the proportion equation
   8,622.89 : 12,936.50 = 2,779.37 : x
2. Step 2: Convert to fraction form
   8,622.89/12,936.50 = 2,779.37/x
3. Step 3: Cross multiply
   8,622.89x = 12,936.50 × 2,779.37
4. Step 4: Simplify right side
   8,622.89x = 35,955,320.01
5. Step 5: Solve for x
   x = 35,955,320.01/8,622.89
6. Step 6: Final answer
   x = 4,169.75