Finding the Third Proportional to 91,443,128 and 139,308,478

Step by Step Solution

1. Step 1: Write the proportion equation
   91,443,128 : 139,308,478 = 139,308,478 : x
2. Step 2: Convert to fraction form
   91,443,128/139,308,478 = 139,308,478/x
3. Step 3: Cross multiply
   91,443,128x = 139,308,478 × 139,308,478
4. Step 4: Simplify right side
   91,443,128x = 19,406,852,042,676,484
5. Step 5: Solve for x
   x = 19,406,852,042,676,484/91,443,128
6. Step 6: Final answer
   x = 212,228,654.76