Finding the Fourth Proportional to 12,132, 18,178.50 and 10,188

Step by Step Solution

1. Step 1: Write the proportion equation
   12,132 : 18,178.50 = 10,188 : x
2. Step 2: Convert to fraction form
   12,132/18,178.50 = 10,188/x
3. Step 3: Cross multiply
   12,132x = 18,178.50 × 10,188
4. Step 4: Simplify right side
   12,132x = 185,202,558
5. Step 5: Solve for x
   x = 185,202,558/12,132
6. Step 6: Final answer
   x = 15,265.62