Finding the Third Proportional to 153,612 and 319,486.50

Step by Step Solution

1. Step 1: Write the proportion equation
   153,612 : 319,486.50 = 319,486.50 : x
2. Step 2: Convert to fraction form
   153,612/319,486.50 = 319,486.50/x
3. Step 3: Cross multiply
   153,612x = 319,486.50 × 319,486.50
4. Step 4: Simplify right side
   153,612x = 102,071,623,682.25
5. Step 5: Solve for x
   x = 102,071,623,682.25/153,612
6. Step 6: Final answer
   x = 664,476.89