Finding the Third Proportional to 428,890.50 and 630,855

Step by Step Solution

1. Step 1: Write the proportion equation
   428,890.50 : 630,855 = 630,855 : x
2. Step 2: Convert to fraction form
   428,890.50/630,855 = 630,855/x
3. Step 3: Cross multiply
   428,890.50x = 630,855 × 630,855
4. Step 4: Simplify right side
   428,890.50x = 397,978,031,025
5. Step 5: Solve for x
   x = 397,978,031,025/428,890.50
6. Step 6: Final answer
   x = 927,924.57