Finding the Third Proportional to 61,021.50 and 89,659.50

Step by Step Solution

1. Step 1: Write the proportion equation
   61,021.50 : 89,659.50 = 89,659.50 : x
2. Step 2: Convert to fraction form
   61,021.50/89,659.50 = 89,659.50/x
3. Step 3: Cross multiply
   61,021.50x = 89,659.50 × 89,659.50
4. Step 4: Simplify right side
   61,021.50x = 8,038,825,940.25
5. Step 5: Solve for x
   x = 8,038,825,940.25/61,021.50
6. Step 6: Final answer
   x = 131,737.60