Finding the Third Proportional to 61,290 and 86,730

Step by Step Solution

1. Step 1: Write the proportion equation
   61,290 : 86,730 = 86,730 : x
2. Step 2: Convert to fraction form
   61,290/86,730 = 86,730/x
3. Step 3: Cross multiply
   61,290x = 86,730 × 86,730
4. Step 4: Simplify right side
   61,290x = 7,522,092,900
5. Step 5: Solve for x
   x = 7,522,092,900/61,290
6. Step 6: Final answer
   x = 122,729.53