Finding the Third Proportional to 56,139.75 and 82,568.53

Step by Step Solution

1. Step 1: Write the proportion equation
   56,139.75 : 82,568.53 = 82,568.53 : x
2. Step 2: Convert to fraction form
   56,139.75/82,568.53 = 82,568.53/x
3. Step 3: Cross multiply
   56,139.75x = 82,568.53 × 82,568.53
4. Step 4: Simplify right side
   56,139.75x = 6,817,562,352.78
5. Step 5: Solve for x
   x = 6,817,562,352.78/56,139.75
6. Step 6: Final answer
   x = 121,439.13