Finding the Third Proportional to 4,200,392 and 9,161,040

Step by Step Solution

1. Step 1: Write the proportion equation
   4,200,392 : 9,161,040 = 9,161,040 : x
2. Step 2: Convert to fraction form
   4,200,392/9,161,040 = 9,161,040/x
3. Step 3: Cross multiply
   4,200,392x = 9,161,040 × 9,161,040
4. Step 4: Simplify right side
   4,200,392x = 83,924,653,881,600
5. Step 5: Solve for x
   x = 83,924,653,881,600/4,200,392
6. Step 6: Final answer
   x = 19,980,195.63