Finding the Third Proportional to 428,790 and 630,346.50

Step by Step Solution

1. Step 1: Write the proportion equation
   428,790 : 630,346.50 = 630,346.50 : x
2. Step 2: Convert to fraction form
   428,790/630,346.50 = 630,346.50/x
3. Step 3: Cross multiply
   428,790x = 630,346.50 × 630,346.50
4. Step 4: Simplify right side
   428,790x = 397,336,710,062.25
5. Step 5: Solve for x
   x = 397,336,710,062.25/428,790
6. Step 6: Final answer
   x = 926,646.40