Finding the Third Proportional to 401,004,128.25 and 638,076,386.25

Step by Step Solution

1. Step 1: Write the proportion equation
   401,004,128.25 : 638,076,386.25 = 638,076,386.25 : x
2. Step 2: Convert to fraction form
   401,004,128.25/638,076,386.25 = 638,076,386.25/x
3. Step 3: Cross multiply
   401,004,128.25x = 638,076,386.25 × 638,076,386.25
4. Step 4: Simplify right side
   401,004,128.25x = 407,141,474,689,859,200
5. Step 5: Solve for x
   x = 407,141,474,689,859,200/401,004,128.25
6. Step 6: Final answer
   x = 1,015,304,945.78