Finding the Third Proportional to 149,269.50 and 315,387

Step by Step Solution

1. Step 1: Write the proportion equation
   149,269.50 : 315,387 = 315,387 : x
2. Step 2: Convert to fraction form
   149,269.50/315,387 = 315,387/x
3. Step 3: Cross multiply
   149,269.50x = 315,387 × 315,387
4. Step 4: Simplify right side
   149,269.50x = 99,468,959,769
5. Step 5: Solve for x
   x = 99,468,959,769/149,269.50
6. Step 6: Final answer
   x = 666,371.63