Finding the Third Proportional to 121,186.50 and 258,867

Step by Step Solution

1. Step 1: Write the proportion equation
   121,186.50 : 258,867 = 258,867 : x
2. Step 2: Convert to fraction form
   121,186.50/258,867 = 258,867/x
3. Step 3: Cross multiply
   121,186.50x = 258,867 × 258,867
4. Step 4: Simplify right side
   121,186.50x = 67,012,123,689
5. Step 5: Solve for x
   x = 67,012,123,689/121,186.50
6. Step 6: Final answer
   x = 552,966.90