Finding the Third Proportional to 61,431 and 86,566.50

Step by Step Solution

1. Step 1: Write the proportion equation
   61,431 : 86,566.50 = 86,566.50 : x
2. Step 2: Convert to fraction form
   61,431/86,566.50 = 86,566.50/x
3. Step 3: Cross multiply
   61,431x = 86,566.50 × 86,566.50
4. Step 4: Simplify right side
   61,431x = 7,493,758,922.25
5. Step 5: Solve for x
   x = 7,493,758,922.25/61,431
6. Step 6: Final answer
   x = 121,986.60