Finding the Third Proportional to 491,128.50 and 738,520.50

Step by Step Solution

1. Step 1: Write the proportion equation
   491,128.50 : 738,520.50 = 738,520.50 : x
2. Step 2: Convert to fraction form
   491,128.50/738,520.50 = 738,520.50/x
3. Step 3: Cross multiply
   491,128.50x = 738,520.50 × 738,520.50
4. Step 4: Simplify right side
   491,128.50x = 545,412,528,920.25
5. Step 5: Solve for x
   x = 545,412,528,920.25/491,128.50
6. Step 6: Final answer
   x = 1,110,529.18