Finding the Third Proportional to 128,724 and 196,915.50

Step by Step Solution

1. Step 1: Write the proportion equation
   128,724 : 196,915.50 = 196,915.50 : x
2. Step 2: Convert to fraction form
   128,724/196,915.50 = 196,915.50/x
3. Step 3: Cross multiply
   128,724x = 196,915.50 × 196,915.50
4. Step 4: Simplify right side
   128,724x = 38,775,714,140.25
5. Step 5: Solve for x
   x = 38,775,714,140.25/128,724
6. Step 6: Final answer
   x = 301,231.43