Finding the Fourth Proportional to 12,089, 18,135.12 and 5,165.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,089 : 18,135.12 = 5,165.12 : x
2. Step 2: Convert to fraction form
   12,089/18,135.12 = 5,165.12/x
3. Step 3: Cross multiply
   12,089x = 18,135.12 × 5,165.12
4. Step 4: Simplify right side
   12,089x = 93,670,071.01
5. Step 5: Solve for x
   x = 93,670,071.01/12,089
6. Step 6: Final answer
   x = 7,748.37