Finding the Third Proportional to 7,918.50 and 12,310.50

Step by Step Solution

1. Step 1: Write the proportion equation
   7,918.50 : 12,310.50 = 12,310.50 : x
2. Step 2: Convert to fraction form
   7,918.50/12,310.50 = 12,310.50/x
3. Step 3: Cross multiply
   7,918.50x = 12,310.50 × 12,310.50
4. Step 4: Simplify right side
   7,918.50x = 151,548,410.25
5. Step 5: Solve for x
   x = 151,548,410.25/7,918.50
6. Step 6: Final answer
   x = 19,138.53