Finding the Third Proportional to 202,915 and 315,424.50

Step by Step Solution

1. Step 1: Write the proportion equation
   202,915 : 315,424.50 = 315,424.50 : x
2. Step 2: Convert to fraction form
   202,915/315,424.50 = 315,424.50/x
3. Step 3: Cross multiply
   202,915x = 315,424.50 × 315,424.50
4. Step 4: Simplify right side
   202,915x = 99,492,615,200.25
5. Step 5: Solve for x
   x = 99,492,615,200.25/202,915
6. Step 6: Final answer
   x = 490,316.71