Finding the Third Proportional to 67,081.50 and 90,780.75

Step by Step Solution

1. Step 1: Write the proportion equation
   67,081.50 : 90,780.75 = 90,780.75 : x
2. Step 2: Convert to fraction form
   67,081.50/90,780.75 = 90,780.75/x
3. Step 3: Cross multiply
   67,081.50x = 90,780.75 × 90,780.75
4. Step 4: Simplify right side
   67,081.50x = 8,241,144,570.56
5. Step 5: Solve for x
   x = 8,241,144,570.56/67,081.50
6. Step 6: Final answer
   x = 122,852.72