Finding the Third Proportional to 91,288.50 and 196,620.75

Step by Step Solution

1. Step 1: Write the proportion equation
   91,288.50 : 196,620.75 = 196,620.75 : x
2. Step 2: Convert to fraction form
   91,288.50/196,620.75 = 196,620.75/x
3. Step 3: Cross multiply
   91,288.50x = 196,620.75 × 196,620.75
4. Step 4: Simplify right side
   91,288.50x = 38,659,719,330.56
5. Step 5: Solve for x
   x = 38,659,719,330.56/91,288.50
6. Step 6: Final answer
   x = 423,489.48