Finding the Fourth Proportional to 12,981.89, 17,915.01 and 7,013.55

Step by Step Solution

1. Step 1: Write the proportion equation
   12,981.89 : 17,915.01 = 7,013.55 : x
2. Step 2: Convert to fraction form
   12,981.89/17,915.01 = 7,013.55/x
3. Step 3: Cross multiply
   12,981.89x = 17,915.01 × 7,013.55
4. Step 4: Simplify right side
   12,981.89x = 125,647,818.39
5. Step 5: Solve for x
   x = 125,647,818.39/12,981.89
6. Step 6: Final answer
   x = 9,678.70