Finding the Third Proportional to 131,128.88 and 285,608.53

Step by Step Solution

1. Step 1: Write the proportion equation
   131,128.88 : 285,608.53 = 285,608.53 : x
2. Step 2: Convert to fraction form
   131,128.88/285,608.53 = 285,608.53/x
3. Step 3: Cross multiply
   131,128.88x = 285,608.53 × 285,608.53
4. Step 4: Simplify right side
   131,128.88x = 81,572,233,122.78
5. Step 5: Solve for x
   x = 81,572,233,122.78/131,128.88
6. Step 6: Final answer
   x = 622,076.82