Finding the Third Proportional to 138,789 and 298,628.25

Step by Step Solution

1. Step 1: Write the proportion equation
   138,789 : 298,628.25 = 298,628.25 : x
2. Step 2: Convert to fraction form
   138,789/298,628.25 = 298,628.25/x
3. Step 3: Cross multiply
   138,789x = 298,628.25 × 298,628.25
4. Step 4: Simplify right side
   138,789x = 89,178,831,698.06
5. Step 5: Solve for x
   x = 89,178,831,698.06/138,789
6. Step 6: Final answer
   x = 642,549.71