Finding the Fourth Proportional to 12,680.37, 19,019.34 and 3,915.36

Step by Step Solution

1. Step 1: Write the proportion equation
   12,680.37 : 19,019.34 = 3,915.36 : x
2. Step 2: Convert to fraction form
   12,680.37/19,019.34 = 3,915.36/x
3. Step 3: Cross multiply
   12,680.37x = 19,019.34 × 3,915.36
4. Step 4: Simplify right side
   12,680.37x = 74,467,563.06
5. Step 5: Solve for x
   x = 74,467,563.06/12,680.37
6. Step 6: Final answer
   x = 5,872.66