Finding the Third Proportional to 7,121.25 and 14,242.50

Step by Step Solution

1. Step 1: Write the proportion equation
   7,121.25 : 14,242.50 = 14,242.50 : x
2. Step 2: Convert to fraction form
   7,121.25/14,242.50 = 14,242.50/x
3. Step 3: Cross multiply
   7,121.25x = 14,242.50 × 14,242.50
4. Step 4: Simplify right side
   7,121.25x = 202,848,806.25
5. Step 5: Solve for x
   x = 202,848,806.25/7,121.25
6. Step 6: Final answer
   x = 28,485