Finding the Third Proportional to 9,691,863,680 and 21,081,830,808

Step by Step Solution

1. Step 1: Write the proportion equation
   9,691,863,680 : 21,081,830,808 = 21,081,830,808 : x
2. Step 2: Convert to fraction form
   9,691,863,680/21,081,830,808 = 21,081,830,808/x
3. Step 3: Cross multiply
   9,691,863,680x = 21,081,830,808 × 21,081,830,808
4. Step 4: Simplify right side
   9,691,863,680x = 444,443,590,217,137,913,856
5. Step 5: Solve for x
   x = 444,443,590,217,137,913,856/9,691,863,680
6. Step 6: Final answer
   x = 45,857,391,817.66