Finding the Third Proportional to 18,915 and 41,290.50

Step by Step Solution

1. Step 1: Write the proportion equation
   18,915 : 41,290.50 = 41,290.50 : x
2. Step 2: Convert to fraction form
   18,915/41,290.50 = 41,290.50/x
3. Step 3: Cross multiply
   18,915x = 41,290.50 × 41,290.50
4. Step 4: Simplify right side
   18,915x = 1,704,905,390.25
5. Step 5: Solve for x
   x = 1,704,905,390.25/18,915
6. Step 6: Final answer
   x = 90,135.10