Finding the Third Proportional to 607,215 and 905,890.50

Step by Step Solution

1. Step 1: Write the proportion equation
   607,215 : 905,890.50 = 905,890.50 : x
2. Step 2: Convert to fraction form
   607,215/905,890.50 = 905,890.50/x
3. Step 3: Cross multiply
   607,215x = 905,890.50 × 905,890.50
4. Step 4: Simplify right side
   607,215x = 820,637,597,990.25
5. Step 5: Solve for x
   x = 820,637,597,990.25/607,215
6. Step 6: Final answer
   x = 1,351,477.81