Finding the Third Proportional to 81,129.50 and 121,019.25

Step by Step Solution

1. Step 1: Write the proportion equation
   81,129.50 : 121,019.25 = 121,019.25 : x
2. Step 2: Convert to fraction form
   81,129.50/121,019.25 = 121,019.25/x
3. Step 3: Cross multiply
   81,129.50x = 121,019.25 × 121,019.25
4. Step 4: Simplify right side
   81,129.50x = 14,645,658,870.56
5. Step 5: Solve for x
   x = 14,645,658,870.56/81,129.50
6. Step 6: Final answer
   x = 180,521.99