Finding the Fourth Proportional to 12,915.92, 19,385.76 and 10,012.88

Step by Step Solution

1. Step 1: Write the proportion equation
   12,915.92 : 19,385.76 = 10,012.88 : x
2. Step 2: Convert to fraction form
   12,915.92/19,385.76 = 10,012.88/x
3. Step 3: Cross multiply
   12,915.92x = 19,385.76 × 10,012.88
4. Step 4: Simplify right side
   12,915.92x = 194,107,288.59
5. Step 5: Solve for x
   x = 194,107,288.59/12,915.92
6. Step 6: Final answer
   x = 15,028.53