Finding the Third Proportional to 148,530 and 309,300

Step by Step Solution

1. Step 1: Write the proportion equation
   148,530 : 309,300 = 309,300 : x
2. Step 2: Convert to fraction form
   148,530/309,300 = 309,300/x
3. Step 3: Cross multiply
   148,530x = 309,300 × 309,300
4. Step 4: Simplify right side
   148,530x = 95,666,490,000
5. Step 5: Solve for x
   x = 95,666,490,000/148,530
6. Step 6: Final answer
   x = 644,088.67