Finding the Third Proportional to 438,318 and 655,708.50

Step by Step Solution

1. Step 1: Write the proportion equation
   438,318 : 655,708.50 = 655,708.50 : x
2. Step 2: Convert to fraction form
   438,318/655,708.50 = 655,708.50/x
3. Step 3: Cross multiply
   438,318x = 655,708.50 × 655,708.50
4. Step 4: Simplify right side
   438,318x = 429,953,636,972.25
5. Step 5: Solve for x
   x = 429,953,636,972.25/438,318
6. Step 6: Final answer
   x = 980,917.14