Finding the Third Proportional to 413,528 and 638,425.50

Step by Step Solution

1. Step 1: Write the proportion equation
   413,528 : 638,425.50 = 638,425.50 : x
2. Step 2: Convert to fraction form
   413,528/638,425.50 = 638,425.50/x
3. Step 3: Cross multiply
   413,528x = 638,425.50 × 638,425.50
4. Step 4: Simplify right side
   413,528x = 407,587,119,050.25
5. Step 5: Solve for x
   x = 407,587,119,050.25/413,528
6. Step 6: Final answer
   x = 985,633.67