Finding the Third Proportional to 145,275 and 316,282.50

Step by Step Solution

1. Step 1: Write the proportion equation
   145,275 : 316,282.50 = 316,282.50 : x
2. Step 2: Convert to fraction form
   145,275/316,282.50 = 316,282.50/x
3. Step 3: Cross multiply
   145,275x = 316,282.50 × 316,282.50
4. Step 4: Simplify right side
   145,275x = 100,034,619,806.25
5. Step 5: Solve for x
   x = 100,034,619,806.25/145,275
6. Step 6: Final answer
   x = 688,587.99