Finding the Fourth Proportional to 8,788.49, 12,128.09 and 4,809.57

Step by Step Solution

1. Step 1: Write the proportion equation
   8,788.49 : 12,128.09 = 4,809.57 : x
2. Step 2: Convert to fraction form
   8,788.49/12,128.09 = 4,809.57/x
3. Step 3: Cross multiply
   8,788.49x = 12,128.09 × 4,809.57
4. Step 4: Simplify right side
   8,788.49x = 58,330,897.82
5. Step 5: Solve for x
   x = 58,330,897.82/8,788.49
6. Step 6: Final answer
   x = 6,637.19