Finding the Third Proportional to 148,540 and 309,316

Step by Step Solution

1. Step 1: Write the proportion equation
   148,540 : 309,316 = 309,316 : x
2. Step 2: Convert to fraction form
   148,540/309,316 = 309,316/x
3. Step 3: Cross multiply
   148,540x = 309,316 × 309,316
4. Step 4: Simplify right side
   148,540x = 95,676,387,856
5. Step 5: Solve for x
   x = 95,676,387,856/148,540
6. Step 6: Final answer
   x = 644,111.94