Finding the Third Proportional to 128,693 and 198,031.50

Step by Step Solution

1. Step 1: Write the proportion equation
   128,693 : 198,031.50 = 198,031.50 : x
2. Step 2: Convert to fraction form
   128,693/198,031.50 = 198,031.50/x
3. Step 3: Cross multiply
   128,693x = 198,031.50 × 198,031.50
4. Step 4: Simplify right side
   128,693x = 39,216,474,992.25
5. Step 5: Solve for x
   x = 39,216,474,992.25/128,693
6. Step 6: Final answer
   x = 304,728.89