Finding the Third Proportional to 139,528 and 298,736

Step by Step Solution

1. Step 1: Write the proportion equation
   139,528 : 298,736 = 298,736 : x
2. Step 2: Convert to fraction form
   139,528/298,736 = 298,736/x
3. Step 3: Cross multiply
   139,528x = 298,736 × 298,736
4. Step 4: Simplify right side
   139,528x = 89,243,197,696
5. Step 5: Solve for x
   x = 89,243,197,696/139,528
6. Step 6: Final answer
   x = 639,607.80