Finding the Third Proportional to 163,840 and 221,357.50

Step by Step Solution

1. Step 1: Write the proportion equation
   163,840 : 221,357.50 = 221,357.50 : x
2. Step 2: Convert to fraction form
   163,840/221,357.50 = 221,357.50/x
3. Step 3: Cross multiply
   163,840x = 221,357.50 × 221,357.50
4. Step 4: Simplify right side
   163,840x = 48,999,142,806.25
5. Step 5: Solve for x
   x = 48,999,142,806.25/163,840
6. Step 6: Final answer
   x = 299,067.03