Finding the Third Proportional to 145,479 and 218,758.50

Step by Step Solution

1. Step 1: Write the proportion equation
   145,479 : 218,758.50 = 218,758.50 : x
2. Step 2: Convert to fraction form
   145,479/218,758.50 = 218,758.50/x
3. Step 3: Cross multiply
   145,479x = 218,758.50 × 218,758.50
4. Step 4: Simplify right side
   145,479x = 47,855,281,322.25
5. Step 5: Solve for x
   x = 47,855,281,322.25/145,479
6. Step 6: Final answer
   x = 328,949.75