Finding the Fourth Proportional to 12,915.50, 19,376.50 and 3,681.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,915.50 : 19,376.50 = 3,681.50 : x
2. Step 2: Convert to fraction form
   12,915.50/19,376.50 = 3,681.50/x
3. Step 3: Cross multiply
   12,915.50x = 19,376.50 × 3,681.50
4. Step 4: Simplify right side
   12,915.50x = 71,334,584.75
5. Step 5: Solve for x
   x = 71,334,584.75/12,915.50
6. Step 6: Final answer
   x = 5,523.18