Finding the Third Proportional to 138,079,188 and 297,678,456

Step by Step Solution

1. Step 1: Write the proportion equation
   138,079,188 : 297,678,456 = 297,678,456 : x
2. Step 2: Convert to fraction form
   138,079,188/297,678,456 = 297,678,456/x
3. Step 3: Cross multiply
   138,079,188x = 297,678,456 × 297,678,456
4. Step 4: Simplify right side
   138,079,188x = 88,612,463,166,543,936
5. Step 5: Solve for x
   x = 88,612,463,166,543,936/138,079,188
6. Step 6: Final answer
   x = 641,751,044.82