Finding the Third Proportional to 9,407,438 and 19,945,280

Step by Step Solution

1. Step 1: Write the proportion equation
   9,407,438 : 19,945,280 = 19,945,280 : x
2. Step 2: Convert to fraction form
   9,407,438/19,945,280 = 19,945,280/x
3. Step 3: Cross multiply
   9,407,438x = 19,945,280 × 19,945,280
4. Step 4: Simplify right side
   9,407,438x = 397,814,194,278,400
5. Step 5: Solve for x
   x = 397,814,194,278,400/9,407,438
6. Step 6: Final answer
   x = 42,287,198.10