Finding the Third Proportional to 603,570 and 905,428.50

Step by Step Solution

1. Step 1: Write the proportion equation
   603,570 : 905,428.50 = 905,428.50 : x
2. Step 2: Convert to fraction form
   603,570/905,428.50 = 905,428.50/x
3. Step 3: Cross multiply
   603,570x = 905,428.50 × 905,428.50
4. Step 4: Simplify right side
   603,570x = 819,800,768,612.25
5. Step 5: Solve for x
   x = 819,800,768,612.25/603,570
6. Step 6: Final answer
   x = 1,358,253.01