Finding the Fourth Proportional to 12,189.52, 18,281.68 and 3,870.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,189.52 : 18,281.68 = 3,870.28 : x
2. Step 2: Convert to fraction form
   12,189.52/18,281.68 = 3,870.28/x
3. Step 3: Cross multiply
   12,189.52x = 18,281.68 × 3,870.28
4. Step 4: Simplify right side
   12,189.52x = 70,755,220.47
5. Step 5: Solve for x
   x = 70,755,220.47/12,189.52
6. Step 6: Final answer
   x = 5,804.59