Finding the Third Proportional to 61,231 and 86,665.50

Step by Step Solution

1. Step 1: Write the proportion equation
   61,231 : 86,665.50 = 86,665.50 : x
2. Step 2: Convert to fraction form
   61,231/86,665.50 = 86,665.50/x
3. Step 3: Cross multiply
   61,231x = 86,665.50 × 86,665.50
4. Step 4: Simplify right side
   61,231x = 7,510,908,890.25
5. Step 5: Solve for x
   x = 7,510,908,890.25/61,231
6. Step 6: Final answer
   x = 122,665.14