Finding the Third Proportional to 216,318 and 296,770.50

Step by Step Solution

1. Step 1: Write the proportion equation
   216,318 : 296,770.50 = 296,770.50 : x
2. Step 2: Convert to fraction form
   216,318/296,770.50 = 296,770.50/x
3. Step 3: Cross multiply
   216,318x = 296,770.50 × 296,770.50
4. Step 4: Simplify right side
   216,318x = 88,072,729,670.25
5. Step 5: Solve for x
   x = 88,072,729,670.25/216,318
6. Step 6: Final answer
   x = 407,144.71