Finding the Fourth Proportional to 12,189.31, 18,280.24 and 5,169.19

Step by Step Solution

1. Step 1: Write the proportion equation
   12,189.31 : 18,280.24 = 5,169.19 : x
2. Step 2: Convert to fraction form
   12,189.31/18,280.24 = 5,169.19/x
3. Step 3: Cross multiply
   12,189.31x = 18,280.24 × 5,169.19
4. Step 4: Simplify right side
   12,189.31x = 94,494,033.81
5. Step 5: Solve for x
   x = 94,494,033.81/12,189.31
6. Step 6: Final answer
   x = 7,752.21