Finding the Third Proportional to 57,858 and 86,550

Step by Step Solution

1. Step 1: Write the proportion equation
   57,858 : 86,550 = 86,550 : x
2. Step 2: Convert to fraction form
   57,858/86,550 = 86,550/x
3. Step 3: Cross multiply
   57,858x = 86,550 × 86,550
4. Step 4: Simplify right side
   57,858x = 7,490,902,500
5. Step 5: Solve for x
   x = 7,490,902,500/57,858
6. Step 6: Final answer
   x = 129,470.47