Finding the Third Proportional to 128,121 and 195,280.50

Step by Step Solution

1. Step 1: Write the proportion equation
   128,121 : 195,280.50 = 195,280.50 : x
2. Step 2: Convert to fraction form
   128,121/195,280.50 = 195,280.50/x
3. Step 3: Cross multiply
   128,121x = 195,280.50 × 195,280.50
4. Step 4: Simplify right side
   128,121x = 38,134,473,680.25
5. Step 5: Solve for x
   x = 38,134,473,680.25/128,121
6. Step 6: Final answer
   x = 297,644.21