Finding the Fourth Proportional to 12,290.15, 18,436.41 and 4,892.87

Step by Step Solution

1. Step 1: Write the proportion equation
   12,290.15 : 18,436.41 = 4,892.87 : x
2. Step 2: Convert to fraction form
   12,290.15/18,436.41 = 4,892.87/x
3. Step 3: Cross multiply
   12,290.15x = 18,436.41 × 4,892.87
4. Step 4: Simplify right side
   12,290.15x = 90,207,003.49
5. Step 5: Solve for x
   x = 90,207,003.49/12,290.15
6. Step 6: Final answer
   x = 7,339.78