Finding the Third Proportional to 139,404 and 221,539.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,404 : 221,539.50 = 221,539.50 : x
2. Step 2: Convert to fraction form
   139,404/221,539.50 = 221,539.50/x
3. Step 3: Cross multiply
   139,404x = 221,539.50 × 221,539.50
4. Step 4: Simplify right side
   139,404x = 49,079,750,060.25
5. Step 5: Solve for x
   x = 49,079,750,060.25/139,404
6. Step 6: Final answer
   x = 352,068.45