Finding the Third Proportional to 142,978 and 236,931

Step by Step Solution

1. Step 1: Write the proportion equation
   142,978 : 236,931 = 236,931 : x
2. Step 2: Convert to fraction form
   142,978/236,931 = 236,931/x
3. Step 3: Cross multiply
   142,978x = 236,931 × 236,931
4. Step 4: Simplify right side
   142,978x = 56,136,298,761
5. Step 5: Solve for x
   x = 56,136,298,761/142,978
6. Step 6: Final answer
   x = 392,621.93