Finding the Third Proportional to 139,101.75 and 218,443.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,101.75 : 218,443.50 = 218,443.50 : x
2. Step 2: Convert to fraction form
   139,101.75/218,443.50 = 218,443.50/x
3. Step 3: Cross multiply
   139,101.75x = 218,443.50 × 218,443.50
4. Step 4: Simplify right side
   139,101.75x = 47,717,562,692.25
5. Step 5: Solve for x
   x = 47,717,562,692.25/139,101.75
6. Step 6: Final answer
   x = 343,040.71