Finding the Fourth Proportional to 13,308.09, 18,363.15 and 7,643.08

Step by Step Solution

1. Step 1: Write the proportion equation
   13,308.09 : 18,363.15 = 7,643.08 : x
2. Step 2: Convert to fraction form
   13,308.09/18,363.15 = 7,643.08/x
3. Step 3: Cross multiply
   13,308.09x = 18,363.15 × 7,643.08
4. Step 4: Simplify right side
   13,308.09x = 140,351,024.50
5. Step 5: Solve for x
   x = 140,351,024.50/13,308.09
6. Step 6: Final answer
   x = 10,546.29