Finding the Third Proportional to 61,290 and 86,730.75

Step by Step Solution

1. Step 1: Write the proportion equation
   61,290 : 86,730.75 = 86,730.75 : x
2. Step 2: Convert to fraction form
   61,290/86,730.75 = 86,730.75/x
3. Step 3: Cross multiply
   61,290x = 86,730.75 × 86,730.75
4. Step 4: Simplify right side
   61,290x = 7,522,222,995.56
5. Step 5: Solve for x
   x = 7,522,222,995.56/61,290
6. Step 6: Final answer
   x = 122,731.65