Finding the Third Proportional to 261,221,916 and 377,607,978

Step by Step Solution

1. Step 1: Write the proportion equation
   261,221,916 : 377,607,978 = 377,607,978 : x
2. Step 2: Convert to fraction form
   261,221,916/377,607,978 = 377,607,978/x
3. Step 3: Cross multiply
   261,221,916x = 377,607,978 × 377,607,978
4. Step 4: Simplify right side
   261,221,916x = 142,587,785,049,248,480
5. Step 5: Solve for x
   x = 142,587,785,049,248,480/261,221,916
6. Step 6: Final answer
   x = 545,849,242.79