Finding the Fourth Proportional to 12,429.63, 17,146.43 and 7,705.71

Step by Step Solution

1. Step 1: Write the proportion equation
   12,429.63 : 17,146.43 = 7,705.71 : x
2. Step 2: Convert to fraction form
   12,429.63/17,146.43 = 7,705.71/x
3. Step 3: Cross multiply
   12,429.63x = 17,146.43 × 7,705.71
4. Step 4: Simplify right side
   12,429.63x = 132,125,378.59
5. Step 5: Solve for x
   x = 132,125,378.59/12,429.63
6. Step 6: Final answer
   x = 10,629.87