Finding the Fourth Proportional to 8,918.69, 12,307.89 and 4,939.88

Step by Step Solution

1. Step 1: Write the proportion equation
   8,918.69 : 12,307.89 = 4,939.88 : x
2. Step 2: Convert to fraction form
   8,918.69/12,307.89 = 4,939.88/x
3. Step 3: Cross multiply
   8,918.69x = 12,307.89 × 4,939.88
4. Step 4: Simplify right side
   8,918.69x = 60,799,438.11
5. Step 5: Solve for x
   x = 60,799,438.11/8,918.69
6. Step 6: Final answer
   x = 6,817.09