Finding the Third Proportional to 128,203,209 and 302,336,086.50

Step by Step Solution

1. Step 1: Write the proportion equation
   128,203,209 : 302,336,086.50 = 302,336,086.50 : x
2. Step 2: Convert to fraction form
   128,203,209/302,336,086.50 = 302,336,086.50/x
3. Step 3: Cross multiply
   128,203,209x = 302,336,086.50 × 302,336,086.50
4. Step 4: Simplify right side
   128,203,209x = 91,407,109,200,135,488
5. Step 5: Solve for x
   x = 91,407,109,200,135,488/128,203,209
6. Step 6: Final answer
   x = 712,986,125.02