Finding the Fourth Proportional to 12,982.78, 17,915.72 and 7,318.71

Step by Step Solution

1. Step 1: Write the proportion equation
   12,982.78 : 17,915.72 = 7,318.71 : x
2. Step 2: Convert to fraction form
   12,982.78/17,915.72 = 7,318.71/x
3. Step 3: Cross multiply
   12,982.78x = 17,915.72 × 7,318.71
4. Step 4: Simplify right side
   12,982.78x = 131,119,832.95
5. Step 5: Solve for x
   x = 131,119,832.95/12,982.78
6. Step 6: Final answer
   x = 10,099.52