Finding the Third Proportional to 142,821 and 209,811.94

Step by Step Solution

1. Step 1: Write the proportion equation
   142,821 : 209,811.94 = 209,811.94 : x
2. Step 2: Convert to fraction form
   142,821/209,811.94 = 209,811.94/x
3. Step 3: Cross multiply
   142,821x = 209,811.94 × 209,811.94
4. Step 4: Simplify right side
   142,821x = 44,021,049,117.50
5. Step 5: Solve for x
   x = 44,021,049,117.50/142,821
6. Step 6: Final answer
   x = 308,225.32