Finding the Third Proportional to 19,643.13 and 42,400.65

Step by Step Solution

1. Step 1: Write the proportion equation
   19,643.13 : 42,400.65 = 42,400.65 : x
2. Step 2: Convert to fraction form
   19,643.13/42,400.65 = 42,400.65/x
3. Step 3: Cross multiply
   19,643.13x = 42,400.65 × 42,400.65
4. Step 4: Simplify right side
   19,643.13x = 1,797,815,319.18
5. Step 5: Solve for x
   x = 1,797,815,319.18/19,643.13
6. Step 6: Final answer
   x = 91,523.86