Finding the Fourth Proportional to 12,429.78, 17,145.57 and 7,951.96

Step by Step Solution

1. Step 1: Write the proportion equation
   12,429.78 : 17,145.57 = 7,951.96 : x
2. Step 2: Convert to fraction form
   12,429.78/17,145.57 = 7,951.96/x
3. Step 3: Cross multiply
   12,429.78x = 17,145.57 × 7,951.96
4. Step 4: Simplify right side
   12,429.78x = 136,340,886.82
5. Step 5: Solve for x
   x = 136,340,886.82/12,429.78
6. Step 6: Final answer
   x = 10,968.89