Finding the Third Proportional to 61,200 and 91,980

Step by Step Solution

1. Step 1: Write the proportion equation
   61,200 : 91,980 = 91,980 : x
2. Step 2: Convert to fraction form
   61,200/91,980 = 91,980/x
3. Step 3: Cross multiply
   61,200x = 91,980 × 91,980
4. Step 4: Simplify right side
   61,200x = 8,460,320,400
5. Step 5: Solve for x
   x = 8,460,320,400/61,200
6. Step 6: Final answer
   x = 138,240.53