Finding the Fourth Proportional to 12,286.16, 18,428.60 and 3,966.02

Step by Step Solution

1. Step 1: Write the proportion equation
   12,286.16 : 18,428.60 = 3,966.02 : x
2. Step 2: Convert to fraction form
   12,286.16/18,428.60 = 3,966.02/x
3. Step 3: Cross multiply
   12,286.16x = 18,428.60 × 3,966.02
4. Step 4: Simplify right side
   12,286.16x = 73,088,196.17
5. Step 5: Solve for x
   x = 73,088,196.17/12,286.16
6. Step 6: Final answer
   x = 5,948.82