Finding the Fourth Proportional to 12,636.35, 17,439.33 and 7,259.55

Step by Step Solution

1. Step 1: Write the proportion equation
   12,636.35 : 17,439.33 = 7,259.55 : x
2. Step 2: Convert to fraction form
   12,636.35/17,439.33 = 7,259.55/x
3. Step 3: Cross multiply
   12,636.35x = 17,439.33 × 7,259.55
4. Step 4: Simplify right side
   12,636.35x = 126,601,688.10
5. Step 5: Solve for x
   x = 126,601,688.10/12,636.35
6. Step 6: Final answer
   x = 10,018.85