Finding the Third Proportional to 139,178 and 298,030

Step by Step Solution

1. Step 1: Write the proportion equation
   139,178 : 298,030 = 298,030 : x
2. Step 2: Convert to fraction form
   139,178/298,030 = 298,030/x
3. Step 3: Cross multiply
   139,178x = 298,030 × 298,030
4. Step 4: Simplify right side
   139,178x = 88,821,880,900
5. Step 5: Solve for x
   x = 88,821,880,900/139,178
6. Step 6: Final answer
   x = 638,189.09