Finding the Fourth Proportional to 8,789.41, 12,129.69 and 4,810.78

Step by Step Solution

1. Step 1: Write the proportion equation
   8,789.41 : 12,129.69 = 4,810.78 : x
2. Step 2: Convert to fraction form
   8,789.41/12,129.69 = 4,810.78/x
3. Step 3: Cross multiply
   8,789.41x = 12,129.69 × 4,810.78
4. Step 4: Simplify right side
   8,789.41x = 58,353,270.06
5. Step 5: Solve for x
   x = 58,353,270.06/8,789.41
6. Step 6: Final answer
   x = 6,639.04