Finding the Third Proportional to 128,736 and 269,242.50

Step by Step Solution

1. Step 1: Write the proportion equation
   128,736 : 269,242.50 = 269,242.50 : x
2. Step 2: Convert to fraction form
   128,736/269,242.50 = 269,242.50/x
3. Step 3: Cross multiply
   128,736x = 269,242.50 × 269,242.50
4. Step 4: Simplify right side
   128,736x = 72,491,523,806.25
5. Step 5: Solve for x
   x = 72,491,523,806.25/128,736
6. Step 6: Final answer
   x = 563,102.19