Finding the Fourth Proportional to 12,111.39, 18,169.72 and 5,087.40

Step by Step Solution

1. Step 1: Write the proportion equation
   12,111.39 : 18,169.72 = 5,087.40 : x
2. Step 2: Convert to fraction form
   12,111.39/18,169.72 = 5,087.40/x
3. Step 3: Cross multiply
   12,111.39x = 18,169.72 × 5,087.40
4. Step 4: Simplify right side
   12,111.39x = 92,436,646.25
5. Step 5: Solve for x
   x = 92,436,646.25/12,111.39
6. Step 6: Final answer
   x = 7,632.21