Finding the Third Proportional to 55,990 and 86,820

Step by Step Solution

1. Step 1: Write the proportion equation
   55,990 : 86,820 = 86,820 : x
2. Step 2: Convert to fraction form
   55,990/86,820 = 86,820/x
3. Step 3: Cross multiply
   55,990x = 86,820 × 86,820
4. Step 4: Simplify right side
   55,990x = 7,537,712,400
5. Step 5: Solve for x
   x = 7,537,712,400/55,990
6. Step 6: Final answer
   x = 134,626.05