Finding the Third Proportional to 163,905 and 253,136.50

Step by Step Solution

1. Step 1: Write the proportion equation
   163,905 : 253,136.50 = 253,136.50 : x
2. Step 2: Convert to fraction form
   163,905/253,136.50 = 253,136.50/x
3. Step 3: Cross multiply
   163,905x = 253,136.50 × 253,136.50
4. Step 4: Simplify right side
   163,905x = 64,078,087,632.25
5. Step 5: Solve for x
   x = 64,078,087,632.25/163,905
6. Step 6: Final answer
   x = 390,946.51