Finding the Fourth Proportional to 8,467.31, 12,684.78 and 5,136.58

Step by Step Solution

1. Step 1: Write the proportion equation
   8,467.31 : 12,684.78 = 5,136.58 : x
2. Step 2: Convert to fraction form
   8,467.31/12,684.78 = 5,136.58/x
3. Step 3: Cross multiply
   8,467.31x = 12,684.78 × 5,136.58
4. Step 4: Simplify right side
   8,467.31x = 65,156,387.25
5. Step 5: Solve for x
   x = 65,156,387.25/8,467.31
6. Step 6: Final answer
   x = 7,695.05