Finding the Third Proportional to 28,297.69 and 42,720.75

Step by Step Solution

1. Step 1: Write the proportion equation
   28,297.69 : 42,720.75 = 42,720.75 : x
2. Step 2: Convert to fraction form
   28,297.69/42,720.75 = 42,720.75/x
3. Step 3: Cross multiply
   28,297.69x = 42,720.75 × 42,720.75
4. Step 4: Simplify right side
   28,297.69x = 1,825,062,480.56
5. Step 5: Solve for x
   x = 1,825,062,480.56/28,297.69
6. Step 6: Final answer
   x = 64,495.11