Finding the Third Proportional to 56,139.75 and 86,555.25

Step by Step Solution

1. Step 1: Write the proportion equation
   56,139.75 : 86,555.25 = 86,555.25 : x
2. Step 2: Convert to fraction form
   56,139.75/86,555.25 = 86,555.25/x
3. Step 3: Cross multiply
   56,139.75x = 86,555.25 × 86,555.25
4. Step 4: Simplify right side
   56,139.75x = 7,491,811,302.56
5. Step 5: Solve for x
   x = 7,491,811,302.56/56,139.75
6. Step 6: Final answer
   x = 133,449.32