Finding the Fourth Proportional to 12,798.78, 17,663.61 and 7,134.45

Step by Step Solution

1. Step 1: Write the proportion equation
   12,798.78 : 17,663.61 = 7,134.45 : x
2. Step 2: Convert to fraction form
   12,798.78/17,663.61 = 7,134.45/x
3. Step 3: Cross multiply
   12,798.78x = 17,663.61 × 7,134.45
4. Step 4: Simplify right side
   12,798.78x = 126,020,142.36
5. Step 5: Solve for x
   x = 126,020,142.36/12,798.78
6. Step 6: Final answer
   x = 9,846.26