Finding the Third Proportional to 151,168.78 and 218,521.55

Step by Step Solution

1. Step 1: Write the proportion equation
   151,168.78 : 218,521.55 = 218,521.55 : x
2. Step 2: Convert to fraction form
   151,168.78/218,521.55 = 218,521.55/x
3. Step 3: Cross multiply
   151,168.78x = 218,521.55 × 218,521.55
4. Step 4: Simplify right side
   151,168.78x = 47,751,666,448.64
5. Step 5: Solve for x
   x = 47,751,666,448.64/151,168.78
6. Step 6: Final answer
   x = 315,883.12