Finding the Third Proportional to 131,589 and 288,216

Step by Step Solution

1. Step 1: Write the proportion equation
   131,589 : 288,216 = 288,216 : x
2. Step 2: Convert to fraction form
   131,589/288,216 = 288,216/x
3. Step 3: Cross multiply
   131,589x = 288,216 × 288,216
4. Step 4: Simplify right side
   131,589x = 83,068,462,656
5. Step 5: Solve for x
   x = 83,068,462,656/131,589
6. Step 6: Final answer
   x = 631,272.09