Finding the Third Proportional to 91,215 and 131,989.50

Step by Step Solution

1. Step 1: Write the proportion equation
   91,215 : 131,989.50 = 131,989.50 : x
2. Step 2: Convert to fraction form
   91,215/131,989.50 = 131,989.50/x
3. Step 3: Cross multiply
   91,215x = 131,989.50 × 131,989.50
4. Step 4: Simplify right side
   91,215x = 17,421,228,110.25
5. Step 5: Solve for x
   x = 17,421,228,110.25/91,215
6. Step 6: Final answer
   x = 190,990.83