Finding the Third Proportional to 61,155.25 and 86,120

Step by Step Solution

1. Step 1: Write the proportion equation
   61,155.25 : 86,120 = 86,120 : x
2. Step 2: Convert to fraction form
   61,155.25/86,120 = 86,120/x
3. Step 3: Cross multiply
   61,155.25x = 86,120 × 86,120
4. Step 4: Simplify right side
   61,155.25x = 7,416,654,400
5. Step 5: Solve for x
   x = 7,416,654,400/61,155.25
6. Step 6: Final answer
   x = 121,275.84