Finding the Third Proportional to 128,712 and 196,897.50

Step by Step Solution

1. Step 1: Write the proportion equation
   128,712 : 196,897.50 = 196,897.50 : x
2. Step 2: Convert to fraction form
   128,712/196,897.50 = 196,897.50/x
3. Step 3: Cross multiply
   128,712x = 196,897.50 × 196,897.50
4. Step 4: Simplify right side
   128,712x = 38,768,625,506.25
5. Step 5: Solve for x
   x = 38,768,625,506.25/128,712
6. Step 6: Final answer
   x = 301,204.44