Finding the Third Proportional to 164,317.50 and 336,423

Step by Step Solution

1. Step 1: Write the proportion equation
   164,317.50 : 336,423 = 336,423 : x
2. Step 2: Convert to fraction form
   164,317.50/336,423 = 336,423/x
3. Step 3: Cross multiply
   164,317.50x = 336,423 × 336,423
4. Step 4: Simplify right side
   164,317.50x = 113,180,434,929
5. Step 5: Solve for x
   x = 113,180,434,929/164,317.50
6. Step 6: Final answer
   x = 688,791.12