Finding the Fourth Proportional to 12,282.31, 18,424.82 and 3,518.65

Step by Step Solution

1. Step 1: Write the proportion equation
   12,282.31 : 18,424.82 = 3,518.65 : x
2. Step 2: Convert to fraction form
   12,282.31/18,424.82 = 3,518.65/x
3. Step 3: Cross multiply
   12,282.31x = 18,424.82 × 3,518.65
4. Step 4: Simplify right side
   12,282.31x = 64,830,492.89
5. Step 5: Solve for x
   x = 64,830,492.89/12,282.31
6. Step 6: Final answer
   x = 5,278.36