Finding the Fourth Proportional to 12,057.11, 18,113.38 and 8,507.39

Step by Step Solution

1. Step 1: Write the proportion equation
   12,057.11 : 18,113.38 = 8,507.39 : x
2. Step 2: Convert to fraction form
   12,057.11/18,113.38 = 8,507.39/x
3. Step 3: Cross multiply
   12,057.11x = 18,113.38 × 8,507.39
4. Step 4: Simplify right side
   12,057.11x = 154,097,611.89
5. Step 5: Solve for x
   x = 154,097,611.89/12,057.11
6. Step 6: Final answer
   x = 12,780.65