Finding the Fourth Proportional to 12,282.69, 18,420.87 and 3,515.58

Step by Step Solution

1. Step 1: Write the proportion equation
   12,282.69 : 18,420.87 = 3,515.58 : x
2. Step 2: Convert to fraction form
   12,282.69/18,420.87 = 3,515.58/x
3. Step 3: Cross multiply
   12,282.69x = 18,420.87 × 3,515.58
4. Step 4: Simplify right side
   12,282.69x = 64,760,042.15
5. Step 5: Solve for x
   x = 64,760,042.15/12,282.69
6. Step 6: Final answer
   x = 5,272.46