Finding the Third Proportional to 57,420.56 and 84,489.75

Step by Step Solution

1. Step 1: Write the proportion equation
   57,420.56 : 84,489.75 = 84,489.75 : x
2. Step 2: Convert to fraction form
   57,420.56/84,489.75 = 84,489.75/x
3. Step 3: Cross multiply
   57,420.56x = 84,489.75 × 84,489.75
4. Step 4: Simplify right side
   57,420.56x = 7,138,517,855.06
5. Step 5: Solve for x
   x = 7,138,517,855.06/57,420.56
6. Step 6: Final answer
   x = 124,319.89