Finding the Third Proportional to 100,399.50 and 145,071

Step by Step Solution

1. Step 1: Write the proportion equation
   100,399.50 : 145,071 = 145,071 : x
2. Step 2: Convert to fraction form
   100,399.50/145,071 = 145,071/x
3. Step 3: Cross multiply
   100,399.50x = 145,071 × 145,071
4. Step 4: Simplify right side
   100,399.50x = 21,045,595,041
5. Step 5: Solve for x
   x = 21,045,595,041/100,399.50
6. Step 6: Final answer
   x = 209,618.52