Finding the Third Proportional to 155,485.50 and 418,855.50

Step by Step Solution

1. Step 1: Write the proportion equation
   155,485.50 : 418,855.50 = 418,855.50 : x
2. Step 2: Convert to fraction form
   155,485.50/418,855.50 = 418,855.50/x
3. Step 3: Cross multiply
   155,485.50x = 418,855.50 × 418,855.50
4. Step 4: Simplify right side
   155,485.50x = 175,439,929,880.25
5. Step 5: Solve for x
   x = 175,439,929,880.25/155,485.50
6. Step 6: Final answer
   x = 1,128,336.27