Finding the Third Proportional to 4,321,199 and 9,439,680

Step by Step Solution

1. Step 1: Write the proportion equation
   4,321,199 : 9,439,680 = 9,439,680 : x
2. Step 2: Convert to fraction form
   4,321,199/9,439,680 = 9,439,680/x
3. Step 3: Cross multiply
   4,321,199x = 9,439,680 × 9,439,680
4. Step 4: Simplify right side
   4,321,199x = 89,107,558,502,400
5. Step 5: Solve for x
   x = 89,107,558,502,400/4,321,199
6. Step 6: Final answer
   x = 20,621,026.36