Finding the Fourth Proportional to 8,620.56, 12,918.69 and 3,929.04

Step by Step Solution

1. Step 1: Write the proportion equation
   8,620.56 : 12,918.69 = 3,929.04 : x
2. Step 2: Convert to fraction form
   8,620.56/12,918.69 = 3,929.04/x
3. Step 3: Cross multiply
   8,620.56x = 12,918.69 × 3,929.04
4. Step 4: Simplify right side
   8,620.56x = 50,758,049.76
5. Step 5: Solve for x
   x = 50,758,049.76/8,620.56
6. Step 6: Final answer
   x = 5,888.02