Finding the Fourth Proportional to 8,618.31, 12,915.32 and 3,926.79

Step by Step Solution

1. Step 1: Write the proportion equation
   8,618.31 : 12,915.32 = 3,926.79 : x
2. Step 2: Convert to fraction form
   8,618.31/12,915.32 = 3,926.79/x
3. Step 3: Cross multiply
   8,618.31x = 12,915.32 × 3,926.79
4. Step 4: Simplify right side
   8,618.31x = 50,715,729.79
5. Step 5: Solve for x
   x = 50,715,729.79/8,618.31
6. Step 6: Final answer
   x = 5,884.65