Finding the Third Proportional to 19,415.81 and 40,780.69

Step by Step Solution

1. Step 1: Write the proportion equation
   19,415.81 : 40,780.69 = 40,780.69 : x
2. Step 2: Convert to fraction form
   19,415.81/40,780.69 = 40,780.69/x
3. Step 3: Cross multiply
   19,415.81x = 40,780.69 × 40,780.69
4. Step 4: Simplify right side
   19,415.81x = 1,663,064,472.97
5. Step 5: Solve for x
   x = 1,663,064,472.97/19,415.81
6. Step 6: Final answer
   x = 85,655.16