Finding the Third Proportional to 399,554,952,928 and 820,291,477,886

Step by Step Solution

1. Step 1: Write the proportion equation
   399,554,952,928 : 820,291,477,886 = 820,291,477,886 : x
2. Step 2: Convert to fraction form
   399,554,952,928/820,291,477,886 = 820,291,477,886/x
3. Step 3: Cross multiply
   399,554,952,928x = 820,291,477,886 × 820,291,477,886
4. Step 4: Simplify right side
   399,554,952,928x = 672,878,108,692,397,974,093,824
5. Step 5: Solve for x
   x = 672,878,108,692,397,974,093,824/399,554,952,928
6. Step 6: Final answer
   x = 1,684,068,996,671.03