Finding the Third Proportional to 218,701 and 279,451.50

Step by Step Solution

1. Step 1: Write the proportion equation
   218,701 : 279,451.50 = 279,451.50 : x
2. Step 2: Convert to fraction form
   218,701/279,451.50 = 279,451.50/x
3. Step 3: Cross multiply
   218,701x = 279,451.50 × 279,451.50
4. Step 4: Simplify right side
   218,701x = 78,093,140,852.25
5. Step 5: Solve for x
   x = 78,093,140,852.25/218,701
6. Step 6: Final answer
   x = 357,077.20