Finding the Third Proportional to 7,188 and 10,507.50

Step by Step Solution

1. Step 1: Write the proportion equation
   7,188 : 10,507.50 = 10,507.50 : x
2. Step 2: Convert to fraction form
   7,188/10,507.50 = 10,507.50/x
3. Step 3: Cross multiply
   7,188x = 10,507.50 × 10,507.50
4. Step 4: Simplify right side
   7,188x = 110,407,556.25
5. Step 5: Solve for x
   x = 110,407,556.25/7,188
6. Step 6: Final answer
   x = 15,359.98