Finding the Third Proportional to 300,700.50 and 654,336.50

Step by Step Solution

1. Step 1: Write the proportion equation
   300,700.50 : 654,336.50 = 654,336.50 : x
2. Step 2: Convert to fraction form
   300,700.50/654,336.50 = 654,336.50/x
3. Step 3: Cross multiply
   300,700.50x = 654,336.50 × 654,336.50
4. Step 4: Simplify right side
   300,700.50x = 428,156,255,232.25
5. Step 5: Solve for x
   x = 428,156,255,232.25/300,700.50
6. Step 6: Final answer
   x = 1,423,862.80