Finding the Fourth Proportional to 12,315.47, 18,429.41 and 9,020.39

Step by Step Solution

1. Step 1: Write the proportion equation
   12,315.47 : 18,429.41 = 9,020.39 : x
2. Step 2: Convert to fraction form
   12,315.47/18,429.41 = 9,020.39/x
3. Step 3: Cross multiply
   12,315.47x = 18,429.41 × 9,020.39
4. Step 4: Simplify right side
   12,315.47x = 166,240,328.42
5. Step 5: Solve for x
   x = 166,240,328.42/12,315.47
6. Step 6: Final answer
   x = 13,498.50