Finding the Fourth Proportional to 12,087.50, 18,139.35 and 5,163.62

Step by Step Solution

1. Step 1: Write the proportion equation
   12,087.50 : 18,139.35 = 5,163.62 : x
2. Step 2: Convert to fraction form
   12,087.50/18,139.35 = 5,163.62/x
3. Step 3: Cross multiply
   12,087.50x = 18,139.35 × 5,163.62
4. Step 4: Simplify right side
   12,087.50x = 93,664,710.45
5. Step 5: Solve for x
   x = 93,664,710.45/12,087.50
6. Step 6: Final answer
   x = 7,748.89