Finding the Third Proportional to 428,577.75 and 678,051

Step by Step Solution

1. Step 1: Write the proportion equation
   428,577.75 : 678,051 = 678,051 : x
2. Step 2: Convert to fraction form
   428,577.75/678,051 = 678,051/x
3. Step 3: Cross multiply
   428,577.75x = 678,051 × 678,051
4. Step 4: Simplify right side
   428,577.75x = 459,753,158,601
5. Step 5: Solve for x
   x = 459,753,158,601/428,577.75
6. Step 6: Final answer
   x = 1,072,741.55