Finding the Third Proportional to 58,590 and 90,666

Step by Step Solution

1. Step 1: Write the proportion equation
   58,590 : 90,666 = 90,666 : x
2. Step 2: Convert to fraction form
   58,590/90,666 = 90,666/x
3. Step 3: Cross multiply
   58,590x = 90,666 × 90,666
4. Step 4: Simplify right side
   58,590x = 8,220,323,556
5. Step 5: Solve for x
   x = 8,220,323,556/58,590
6. Step 6: Final answer
   x = 140,302.50