Finding the Third Proportional to 142,839.50 and 272,719

Step by Step Solution

1. Step 1: Write the proportion equation
   142,839.50 : 272,719 = 272,719 : x
2. Step 2: Convert to fraction form
   142,839.50/272,719 = 272,719/x
3. Step 3: Cross multiply
   142,839.50x = 272,719 × 272,719
4. Step 4: Simplify right side
   142,839.50x = 74,375,652,961
5. Step 5: Solve for x
   x = 74,375,652,961/142,839.50
6. Step 6: Final answer
   x = 520,693.88