Finding the Third Proportional to 145,272 and 316,276.50

Step by Step Solution

1. Step 1: Write the proportion equation
   145,272 : 316,276.50 = 316,276.50 : x
2. Step 2: Convert to fraction form
   145,272/316,276.50 = 316,276.50/x
3. Step 3: Cross multiply
   145,272x = 316,276.50 × 316,276.50
4. Step 4: Simplify right side
   145,272x = 100,030,824,452.25
5. Step 5: Solve for x
   x = 100,030,824,452.25/145,272
6. Step 6: Final answer
   x = 688,576.08