Finding the Fourth Proportional to 12,091.67, 18,129 and 4,689.89

Step by Step Solution

1. Step 1: Write the proportion equation
   12,091.67 : 18,129 = 4,689.89 : x
2. Step 2: Convert to fraction form
   12,091.67/18,129 = 4,689.89/x
3. Step 3: Cross multiply
   12,091.67x = 18,129 × 4,689.89
4. Step 4: Simplify right side
   12,091.67x = 85,023,015.81
5. Step 5: Solve for x
   x = 85,023,015.81/12,091.67
6. Step 6: Final answer
   x = 7,031.54