Finding the Third Proportional to 39,615.75 and 86,339.25

Step by Step Solution

1. Step 1: Write the proportion equation
   39,615.75 : 86,339.25 = 86,339.25 : x
2. Step 2: Convert to fraction form
   39,615.75/86,339.25 = 86,339.25/x
3. Step 3: Cross multiply
   39,615.75x = 86,339.25 × 86,339.25
4. Step 4: Simplify right side
   39,615.75x = 7,454,466,090.56
5. Step 5: Solve for x
   x = 7,454,466,090.56/39,615.75
6. Step 6: Final answer
   x = 188,169.25