Finding the Third Proportional to 137,909,728 and 205,668,665.50

Step by Step Solution

1. Step 1: Write the proportion equation
   137,909,728 : 205,668,665.50 = 205,668,665.50 : x
2. Step 2: Convert to fraction form
   137,909,728/205,668,665.50 = 205,668,665.50/x
3. Step 3: Cross multiply
   137,909,728x = 205,668,665.50 × 205,668,665.50
4. Step 4: Simplify right side
   137,909,728x = 42,299,599,968,550,888
5. Step 5: Solve for x
   x = 42,299,599,968,550,888/137,909,728
6. Step 6: Final answer
   x = 306,719,479.34