Finding the Fourth Proportional to 12,189.75, 18,285.29 and 3,870.42

Step by Step Solution

1. Step 1: Write the proportion equation
   12,189.75 : 18,285.29 = 3,870.42 : x
2. Step 2: Convert to fraction form
   12,189.75/18,285.29 = 3,870.42/x
3. Step 3: Cross multiply
   12,189.75x = 18,285.29 × 3,870.42
4. Step 4: Simplify right side
   12,189.75x = 70,771,732.77
5. Step 5: Solve for x
   x = 70,771,732.77/12,189.75
6. Step 6: Final answer
   x = 5,805.84