Finding the Fourth Proportional to 12,282.78, 18,421.05 and 3,515.34

Step by Step Solution

1. Step 1: Write the proportion equation
   12,282.78 : 18,421.05 = 3,515.34 : x
2. Step 2: Convert to fraction form
   12,282.78/18,421.05 = 3,515.34/x
3. Step 3: Cross multiply
   12,282.78x = 18,421.05 × 3,515.34
4. Step 4: Simplify right side
   12,282.78x = 64,756,253.91
5. Step 5: Solve for x
   x = 64,756,253.91/12,282.78
6. Step 6: Final answer
   x = 5,272.12