Finding the Fourth Proportional to 12,146.42, 18,206.12 and 5,131.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,146.42 : 18,206.12 = 5,131.28 : x
2. Step 2: Convert to fraction form
   12,146.42/18,206.12 = 5,131.28/x
3. Step 3: Cross multiply
   12,146.42x = 18,206.12 × 5,131.28
4. Step 4: Simplify right side
   12,146.42x = 93,420,699.43
5. Step 5: Solve for x
   x = 93,420,699.43/12,146.42
6. Step 6: Final answer
   x = 7,691.21