Finding the Third Proportional to 28,136.81 and 42,919.69

Step by Step Solution

1. Step 1: Write the proportion equation
   28,136.81 : 42,919.69 = 42,919.69 : x
2. Step 2: Convert to fraction form
   28,136.81/42,919.69 = 42,919.69/x
3. Step 3: Cross multiply
   28,136.81x = 42,919.69 × 42,919.69
4. Step 4: Simplify right side
   28,136.81x = 1,842,099,575.10
5. Step 5: Solve for x
   x = 1,842,099,575.10/28,136.81
6. Step 6: Final answer
   x = 65,469.38