Finding the Fourth Proportional to 12,222.06, 16,865.60 and 7,186.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,222.06 : 16,865.60 = 7,186.50 : x
2. Step 2: Convert to fraction form
   12,222.06/16,865.60 = 7,186.50/x
3. Step 3: Cross multiply
   12,222.06x = 16,865.60 × 7,186.50
4. Step 4: Simplify right side
   12,222.06x = 121,204,598.47
5. Step 5: Solve for x
   x = 121,204,598.47/12,222.06
6. Step 6: Final answer
   x = 9,916.87