Finding the Third Proportional to 551,157,540 and 816,404,564

Step by Step Solution

1. Step 1: Write the proportion equation
   551,157,540 : 816,404,564 = 816,404,564 : x
2. Step 2: Convert to fraction form
   551,157,540/816,404,564 = 816,404,564/x
3. Step 3: Cross multiply
   551,157,540x = 816,404,564 × 816,404,564
4. Step 4: Simplify right side
   551,157,540x = 666,516,412,120,030,080
5. Step 5: Solve for x
   x = 666,516,412,120,030,080/551,157,540
6. Step 6: Final answer
   x = 1,209,302,901.16