Finding the Fourth Proportional to 12,020.61, 18,034.56 and 8,517.39

Step by Step Solution

1. Step 1: Write the proportion equation
   12,020.61 : 18,034.56 = 8,517.39 : x
2. Step 2: Convert to fraction form
   12,020.61/18,034.56 = 8,517.39/x
3. Step 3: Cross multiply
   12,020.61x = 18,034.56 × 8,517.39
4. Step 4: Simplify right side
   12,020.61x = 153,607,381.00
5. Step 5: Solve for x
   x = 153,607,381.00/12,020.61
6. Step 6: Final answer
   x = 12,778.67