Finding the Third Proportional to 58,120 and 89,809

Step by Step Solution

1. Step 1: Write the proportion equation
   58,120 : 89,809 = 89,809 : x
2. Step 2: Convert to fraction form
   58,120/89,809 = 89,809/x
3. Step 3: Cross multiply
   58,120x = 89,809 × 89,809
4. Step 4: Simplify right side
   58,120x = 8,065,656,481
5. Step 5: Solve for x
   x = 8,065,656,481/58,120
6. Step 6: Final answer
   x = 138,775.92