Finding the Third Proportional to 138,998 and 305,061

Step by Step Solution

1. Step 1: Write the proportion equation
   138,998 : 305,061 = 305,061 : x
2. Step 2: Convert to fraction form
   138,998/305,061 = 305,061/x
3. Step 3: Cross multiply
   138,998x = 305,061 × 305,061
4. Step 4: Simplify right side
   138,998x = 93,062,213,721
5. Step 5: Solve for x
   x = 93,062,213,721/138,998
6. Step 6: Final answer
   x = 669,521.96