Finding the Third Proportional to 138,547.13 and 298,728

Step by Step Solution

1. Step 1: Write the proportion equation
   138,547.13 : 298,728 = 298,728 : x
2. Step 2: Convert to fraction form
   138,547.13/298,728 = 298,728/x
3. Step 3: Cross multiply
   138,547.13x = 298,728 × 298,728
4. Step 4: Simplify right side
   138,547.13x = 89,238,417,984
5. Step 5: Solve for x
   x = 89,238,417,984/138,547.13
6. Step 6: Final answer
   x = 644,101.55