Finding the Third Proportional to 163,915 and 253,150

Step by Step Solution

1. Step 1: Write the proportion equation
   163,915 : 253,150 = 253,150 : x
2. Step 2: Convert to fraction form
   163,915/253,150 = 253,150/x
3. Step 3: Cross multiply
   163,915x = 253,150 × 253,150
4. Step 4: Simplify right side
   163,915x = 64,084,922,500
5. Step 5: Solve for x
   x = 64,084,922,500/163,915
6. Step 6: Final answer
   x = 390,964.36