Finding the Fourth Proportional to 12,783.30, 19,142.55 and 10,191.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,783.30 : 19,142.55 = 10,191.30 : x
2. Step 2: Convert to fraction form
   12,783.30/19,142.55 = 10,191.30/x
3. Step 3: Cross multiply
   12,783.30x = 19,142.55 × 10,191.30
4. Step 4: Simplify right side
   12,783.30x = 195,087,469.82
5. Step 5: Solve for x
   x = 195,087,469.82/12,783.30
6. Step 6: Final answer
   x = 15,261.12