Finding the Third Proportional to 19,720.13 and 42,207.75

Step by Step Solution

1. Step 1: Write the proportion equation
   19,720.13 : 42,207.75 = 42,207.75 : x
2. Step 2: Convert to fraction form
   19,720.13/42,207.75 = 42,207.75/x
3. Step 3: Cross multiply
   19,720.13x = 42,207.75 × 42,207.75
4. Step 4: Simplify right side
   19,720.13x = 1,781,494,160.06
5. Step 5: Solve for x
   x = 1,781,494,160.06/19,720.13
6. Step 6: Final answer
   x = 90,338.89