Finding the Third Proportional to 59,486 and 86,991

Step by Step Solution

1. Step 1: Write the proportion equation
   59,486 : 86,991 = 86,991 : x
2. Step 2: Convert to fraction form
   59,486/86,991 = 86,991/x
3. Step 3: Cross multiply
   59,486x = 86,991 × 86,991
4. Step 4: Simplify right side
   59,486x = 7,567,434,081
5. Step 5: Solve for x
   x = 7,567,434,081/59,486
6. Step 6: Final answer
   x = 127,213.70