Finding the Third Proportional to 218,808 and 279,571.50

Step by Step Solution

1. Step 1: Write the proportion equation
   218,808 : 279,571.50 = 279,571.50 : x
2. Step 2: Convert to fraction form
   218,808/279,571.50 = 279,571.50/x
3. Step 3: Cross multiply
   218,808x = 279,571.50 × 279,571.50
4. Step 4: Simplify right side
   218,808x = 78,160,223,612.25
5. Step 5: Solve for x
   x = 78,160,223,612.25/218,808
6. Step 6: Final answer
   x = 357,209.17