Finding the Fourth Proportional to 12,405.54, 17,122.35 and 7,629.59

Step by Step Solution

1. Step 1: Write the proportion equation
   12,405.54 : 17,122.35 = 7,629.59 : x
2. Step 2: Convert to fraction form
   12,405.54/17,122.35 = 7,629.59/x
3. Step 3: Cross multiply
   12,405.54x = 17,122.35 × 7,629.59
4. Step 4: Simplify right side
   12,405.54x = 130,636,581.75
5. Step 5: Solve for x
   x = 130,636,581.75/12,405.54
6. Step 6: Final answer
   x = 10,530.50