Finding the Fourth Proportional to 12,486.47, 18,597.20 and 12,426.10

Step by Step Solution

1. Step 1: Write the proportion equation
   12,486.47 : 18,597.20 = 12,426.10 : x
2. Step 2: Convert to fraction form
   12,486.47/18,597.20 = 12,426.10/x
3. Step 3: Cross multiply
   12,486.47x = 18,597.20 × 12,426.10
4. Step 4: Simplify right side
   12,486.47x = 231,090,666.92
5. Step 5: Solve for x
   x = 231,090,666.92/12,486.47
6. Step 6: Final answer
   x = 18,507.29