Finding the Third Proportional to 145,542 and 316,711.50

Step by Step Solution

1. Step 1: Write the proportion equation
   145,542 : 316,711.50 = 316,711.50 : x
2. Step 2: Convert to fraction form
   145,542/316,711.50 = 316,711.50/x
3. Step 3: Cross multiply
   145,542x = 316,711.50 × 316,711.50
4. Step 4: Simplify right side
   145,542x = 100,306,174,232.25
5. Step 5: Solve for x
   x = 100,306,174,232.25/145,542
6. Step 6: Final answer
   x = 689,190.57