Finding the Fourth Proportional to 12,695.30, 19,010.55 and 10,103.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,695.30 : 19,010.55 = 10,103.30 : x
2. Step 2: Convert to fraction form
   12,695.30/19,010.55 = 10,103.30/x
3. Step 3: Cross multiply
   12,695.30x = 19,010.55 × 10,103.30
4. Step 4: Simplify right side
   12,695.30x = 192,069,289.82
5. Step 5: Solve for x
   x = 192,069,289.82/12,695.30
6. Step 6: Final answer
   x = 15,129.17