Finding the Third Proportional to 90,618 and 196,807.50

Step by Step Solution

1. Step 1: Write the proportion equation
   90,618 : 196,807.50 = 196,807.50 : x
2. Step 2: Convert to fraction form
   90,618/196,807.50 = 196,807.50/x
3. Step 3: Cross multiply
   90,618x = 196,807.50 × 196,807.50
4. Step 4: Simplify right side
   90,618x = 38,733,192,056.25
5. Step 5: Solve for x
   x = 38,733,192,056.25/90,618
6. Step 6: Final answer
   x = 427,433.76