Finding the Third Proportional to 39,960 and 86,890.50

Step by Step Solution

1. Step 1: Write the proportion equation
   39,960 : 86,890.50 = 86,890.50 : x
2. Step 2: Convert to fraction form
   39,960/86,890.50 = 86,890.50/x
3. Step 3: Cross multiply
   39,960x = 86,890.50 × 86,890.50
4. Step 4: Simplify right side
   39,960x = 7,549,958,990.25
5. Step 5: Solve for x
   x = 7,549,958,990.25/39,960
6. Step 6: Final answer
   x = 188,937.91