Finding the Fourth Proportional to 13,216.61, 18,238.38 and 7,908.27

Step by Step Solution

1. Step 1: Write the proportion equation
   13,216.61 : 18,238.38 = 7,908.27 : x
2. Step 2: Convert to fraction form
   13,216.61/18,238.38 = 7,908.27/x
3. Step 3: Cross multiply
   13,216.61x = 18,238.38 × 7,908.27
4. Step 4: Simplify right side
   13,216.61x = 144,234,003.75
5. Step 5: Solve for x
   x = 144,234,003.75/13,216.61
6. Step 6: Final answer
   x = 10,913.09