Finding the Fourth Proportional to 12,206.72, 16,845.36 and 7,238.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,206.72 : 16,845.36 = 7,238.72 : x
2. Step 2: Convert to fraction form
   12,206.72/16,845.36 = 7,238.72/x
3. Step 3: Cross multiply
   12,206.72x = 16,845.36 × 7,238.72
4. Step 4: Simplify right side
   12,206.72x = 121,938,844.34
5. Step 5: Solve for x
   x = 121,938,844.34/12,206.72
6. Step 6: Final answer
   x = 9,989.48