Finding the Third Proportional to 298,031 and 638,674.50

Step by Step Solution

1. Step 1: Write the proportion equation
   298,031 : 638,674.50 = 638,674.50 : x
2. Step 2: Convert to fraction form
   298,031/638,674.50 = 638,674.50/x
3. Step 3: Cross multiply
   298,031x = 638,674.50 × 638,674.50
4. Step 4: Simplify right side
   298,031x = 407,905,116,950.25
5. Step 5: Solve for x
   x = 407,905,116,950.25/298,031
6. Step 6: Final answer
   x = 1,368,666.74