Finding the Fourth Proportional to 8,918.59, 12,307.89 and 4,940.05

Step by Step Solution

1. Step 1: Write the proportion equation
   8,918.59 : 12,307.89 = 4,940.05 : x
2. Step 2: Convert to fraction form
   8,918.59/12,307.89 = 4,940.05/x
3. Step 3: Cross multiply
   8,918.59x = 12,307.89 × 4,940.05
4. Step 4: Simplify right side
   8,918.59x = 60,801,591.99
5. Step 5: Solve for x
   x = 60,801,591.99/8,918.59
6. Step 6: Final answer
   x = 6,817.40