Finding the Fourth Proportional to 12,628.98, 17,429.17 and 7,039.86

Step by Step Solution

1. Step 1: Write the proportion equation
   12,628.98 : 17,429.17 = 7,039.86 : x
2. Step 2: Convert to fraction form
   12,628.98/17,429.17 = 7,039.86/x
3. Step 3: Cross multiply
   12,628.98x = 17,429.17 × 7,039.86
4. Step 4: Simplify right side
   12,628.98x = 122,698,916.72
5. Step 5: Solve for x
   x = 122,698,916.72/12,628.98
6. Step 6: Final answer
   x = 9,715.66