Finding the Third Proportional to 155,490 and 339,955.50

Step by Step Solution

1. Step 1: Write the proportion equation
   155,490 : 339,955.50 = 339,955.50 : x
2. Step 2: Convert to fraction form
   155,490/339,955.50 = 339,955.50/x
3. Step 3: Cross multiply
   155,490x = 339,955.50 × 339,955.50
4. Step 4: Simplify right side
   155,490x = 115,569,741,980.25
5. Step 5: Solve for x
   x = 115,569,741,980.25/155,490
6. Step 6: Final answer
   x = 743,261.57