Finding the Third Proportional to 57,719.38 and 86,346.81

Step by Step Solution

1. Step 1: Write the proportion equation
   57,719.38 : 86,346.81 = 86,346.81 : x
2. Step 2: Convert to fraction form
   57,719.38/86,346.81 = 86,346.81/x
3. Step 3: Cross multiply
   57,719.38x = 86,346.81 × 86,346.81
4. Step 4: Simplify right side
   57,719.38x = 7,455,772,028.91
5. Step 5: Solve for x
   x = 7,455,772,028.91/57,719.38
6. Step 6: Final answer
   x = 129,172.78