Finding the Fourth Proportional to 12,189.86, 18,285.50 and 3,425.45

Step by Step Solution

1. Step 1: Write the proportion equation
   12,189.86 : 18,285.50 = 3,425.45 : x
2. Step 2: Convert to fraction form
   12,189.86/18,285.50 = 3,425.45/x
3. Step 3: Cross multiply
   12,189.86x = 18,285.50 × 3,425.45
4. Step 4: Simplify right side
   12,189.86x = 62,636,094.56
5. Step 5: Solve for x
   x = 62,636,094.56/12,189.86
6. Step 6: Final answer
   x = 5,138.38