Finding the Third Proportional to 91,990.69 and 197,171.72

Step by Step Solution

1. Step 1: Write the proportion equation
   91,990.69 : 197,171.72 = 197,171.72 : x
2. Step 2: Convert to fraction form
   91,990.69/197,171.72 = 197,171.72/x
3. Step 3: Cross multiply
   91,990.69x = 197,171.72 × 197,171.72
4. Step 4: Simplify right side
   91,990.69x = 38,876,686,674.83
5. Step 5: Solve for x
   x = 38,876,686,674.83/91,990.69
6. Step 6: Final answer
   x = 422,615.46