Finding the Third Proportional to 155,218.50 and 339,498

Step by Step Solution

1. Step 1: Write the proportion equation
   155,218.50 : 339,498 = 339,498 : x
2. Step 2: Convert to fraction form
   155,218.50/339,498 = 339,498/x
3. Step 3: Cross multiply
   155,218.50x = 339,498 × 339,498
4. Step 4: Simplify right side
   155,218.50x = 115,258,892,004
5. Step 5: Solve for x
   x = 115,258,892,004/155,218.50
6. Step 6: Final answer
   x = 742,558.99