Finding the Third Proportional to 142,209 and 307,222

Step by Step Solution

1. Step 1: Write the proportion equation
   142,209 : 307,222 = 307,222 : x
2. Step 2: Convert to fraction form
   142,209/307,222 = 307,222/x
3. Step 3: Cross multiply
   142,209x = 307,222 × 307,222
4. Step 4: Simplify right side
   142,209x = 94,385,357,284
5. Step 5: Solve for x
   x = 94,385,357,284/142,209
6. Step 6: Final answer
   x = 663,708.75