Finding the Third Proportional to 417,789 and 636,475.50

Step by Step Solution

1. Step 1: Write the proportion equation
   417,789 : 636,475.50 = 636,475.50 : x
2. Step 2: Convert to fraction form
   417,789/636,475.50 = 636,475.50/x
3. Step 3: Cross multiply
   417,789x = 636,475.50 × 636,475.50
4. Step 4: Simplify right side
   417,789x = 405,101,062,100.25
5. Step 5: Solve for x
   x = 405,101,062,100.25/417,789
6. Step 6: Final answer
   x = 969,630.75