Finding the Third Proportional to 138,422,860 and 298,731,812

Step by Step Solution

1. Step 1: Write the proportion equation
   138,422,860 : 298,731,812 = 298,731,812 : x
2. Step 2: Convert to fraction form
   138,422,860/298,731,812 = 298,731,812/x
3. Step 3: Cross multiply
   138,422,860x = 298,731,812 × 298,731,812
4. Step 4: Simplify right side
   138,422,860x = 89,240,695,500,803,344
5. Step 5: Solve for x
   x = 89,240,695,500,803,344/138,422,860
6. Step 6: Final answer
   x = 644,696,226.48