Finding the Third Proportional to 19,430 and 42,040

Step by Step Solution

1. Step 1: Write the proportion equation
   19,430 : 42,040 = 42,040 : x
2. Step 2: Convert to fraction form
   19,430/42,040 = 42,040/x
3. Step 3: Cross multiply
   19,430x = 42,040 × 42,040
4. Step 4: Simplify right side
   19,430x = 1,767,361,600
5. Step 5: Solve for x
   x = 1,767,361,600/19,430
6. Step 6: Final answer
   x = 90,960.45