Finding the Fourth Proportional to 12,915.50, 19,342.49 and 8,970.69

Step by Step Solution

1. Step 1: Write the proportion equation
   12,915.50 : 19,342.49 = 8,970.69 : x
2. Step 2: Convert to fraction form
   12,915.50/19,342.49 = 8,970.69/x
3. Step 3: Cross multiply
   12,915.50x = 19,342.49 × 8,970.69
4. Step 4: Simplify right side
   12,915.50x = 173,515,436.76
5. Step 5: Solve for x
   x = 173,515,436.76/12,915.50
6. Step 6: Final answer
   x = 13,434.67