Finding the Third Proportional to 90,408.94 and 196,890.47

Step by Step Solution

1. Step 1: Write the proportion equation
   90,408.94 : 196,890.47 = 196,890.47 : x
2. Step 2: Convert to fraction form
   90,408.94/196,890.47 = 196,890.47/x
3. Step 3: Cross multiply
   90,408.94x = 196,890.47 × 196,890.47
4. Step 4: Simplify right side
   90,408.94x = 38,765,856,684.59
5. Step 5: Solve for x
   x = 38,765,856,684.59/90,408.94
6. Step 6: Final answer
   x = 428,783.46