Finding the Fourth Proportional to 8,488.78, 12,729.93 and 4,591.06

Step by Step Solution

1. Step 1: Write the proportion equation
   8,488.78 : 12,729.93 = 4,591.06 : x
2. Step 2: Convert to fraction form
   8,488.78/12,729.93 = 4,591.06/x
3. Step 3: Cross multiply
   8,488.78x = 12,729.93 × 4,591.06
4. Step 4: Simplify right side
   8,488.78x = 58,443,823.38
5. Step 5: Solve for x
   x = 58,443,823.38/8,488.78
6. Step 6: Final answer
   x = 6,884.83