Finding the Third Proportional to 438,666,931.50 and 681,428,086.50

Step by Step Solution

1. Step 1: Write the proportion equation
   438,666,931.50 : 681,428,086.50 = 681,428,086.50 : x
2. Step 2: Convert to fraction form
   438,666,931.50/681,428,086.50 = 681,428,086.50/x
3. Step 3: Cross multiply
   438,666,931.50x = 681,428,086.50 × 681,428,086.50
4. Step 4: Simplify right side
   438,666,931.50x = 464,344,237,071,051,456
5. Step 5: Solve for x
   x = 464,344,237,071,051,456/438,666,931.50
6. Step 6: Final answer
   x = 1,058,534,855.78