Finding the Third Proportional to 148,539 and 309,319.50

Step by Step Solution

1. Step 1: Write the proportion equation
   148,539 : 309,319.50 = 309,319.50 : x
2. Step 2: Convert to fraction form
   148,539/309,319.50 = 309,319.50/x
3. Step 3: Cross multiply
   148,539x = 309,319.50 × 309,319.50
4. Step 4: Simplify right side
   148,539x = 95,678,553,080.25
5. Step 5: Solve for x
   x = 95,678,553,080.25/148,539
6. Step 6: Final answer
   x = 644,130.86