Finding the Third Proportional to 139,065.75 and 199,120.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,065.75 : 199,120.50 = 199,120.50 : x
2. Step 2: Convert to fraction form
   139,065.75/199,120.50 = 199,120.50/x
3. Step 3: Cross multiply
   139,065.75x = 199,120.50 × 199,120.50
4. Step 4: Simplify right side
   139,065.75x = 39,648,973,520.25
5. Step 5: Solve for x
   x = 39,648,973,520.25/139,065.75
6. Step 6: Final answer
   x = 285,109.55