Finding the Third Proportional to 428,105.25 and 666,670.50

Step by Step Solution

1. Step 1: Write the proportion equation
   428,105.25 : 666,670.50 = 666,670.50 : x
2. Step 2: Convert to fraction form
   428,105.25/666,670.50 = 666,670.50/x
3. Step 3: Cross multiply
   428,105.25x = 666,670.50 × 666,670.50
4. Step 4: Simplify right side
   428,105.25x = 444,449,555,570.25
5. Step 5: Solve for x
   x = 444,449,555,570.25/428,105.25
6. Step 6: Final answer
   x = 1,038,178.24