Finding the Third Proportional to 123,411,168 and 256,388,209.50

Step by Step Solution

1. Step 1: Write the proportion equation
   123,411,168 : 256,388,209.50 = 256,388,209.50 : x
2. Step 2: Convert to fraction form
   123,411,168/256,388,209.50 = 256,388,209.50/x
3. Step 3: Cross multiply
   123,411,168x = 256,388,209.50 × 256,388,209.50
4. Step 4: Simplify right side
   123,411,168x = 65,734,913,970,615,888
5. Step 5: Solve for x
   x = 65,734,913,970,615,888/123,411,168
6. Step 6: Final answer
   x = 532,649,638.08