Finding the Third Proportional to 55,578 and 72,999

Step by Step Solution

1. Step 1: Write the proportion equation
   55,578 : 72,999 = 72,999 : x
2. Step 2: Convert to fraction form
   55,578/72,999 = 72,999/x
3. Step 3: Cross multiply
   55,578x = 72,999 × 72,999
4. Step 4: Simplify right side
   55,578x = 5,328,854,001
5. Step 5: Solve for x
   x = 5,328,854,001/55,578
6. Step 6: Final answer
   x = 95,880.64