Finding the Third Proportional to 4,200,378 and 9,160,972

Step by Step Solution

1. Step 1: Write the proportion equation
   4,200,378 : 9,160,972 = 9,160,972 : x
2. Step 2: Convert to fraction form
   4,200,378/9,160,972 = 9,160,972/x
3. Step 3: Cross multiply
   4,200,378x = 9,160,972 × 9,160,972
4. Step 4: Simplify right side
   4,200,378x = 83,923,407,984,784
5. Step 5: Solve for x
   x = 83,923,407,984,784/4,200,378
6. Step 6: Final answer
   x = 19,979,965.61