Finding the Third Proportional to 19,900.69 and 28,291.78

Step by Step Solution

1. Step 1: Write the proportion equation
   19,900.69 : 28,291.78 = 28,291.78 : x
2. Step 2: Convert to fraction form
   19,900.69/28,291.78 = 28,291.78/x
3. Step 3: Cross multiply
   19,900.69x = 28,291.78 × 28,291.78
4. Step 4: Simplify right side
   19,900.69x = 800,424,886.30
5. Step 5: Solve for x
   x = 800,424,886.30/19,900.69
6. Step 6: Final answer
   x = 40,220.97