Finding the Fourth Proportional to 12,185.70, 18,279.71 and 3,420.59

Step by Step Solution

1. Step 1: Write the proportion equation
   12,185.70 : 18,279.71 = 3,420.59 : x
2. Step 2: Convert to fraction form
   12,185.70/18,279.71 = 3,420.59/x
3. Step 3: Cross multiply
   12,185.70x = 18,279.71 × 3,420.59
4. Step 4: Simplify right side
   12,185.70x = 62,527,284.73
5. Step 5: Solve for x
   x = 62,527,284.73/12,185.70
6. Step 6: Final answer
   x = 5,131.20