Finding the Third Proportional to 57,081.75 and 91,720.75

Step by Step Solution

1. Step 1: Write the proportion equation
   57,081.75 : 91,720.75 = 91,720.75 : x
2. Step 2: Convert to fraction form
   57,081.75/91,720.75 = 91,720.75/x
3. Step 3: Cross multiply
   57,081.75x = 91,720.75 × 91,720.75
4. Step 4: Simplify right side
   57,081.75x = 8,412,695,980.56
5. Step 5: Solve for x
   x = 8,412,695,980.56/57,081.75
6. Step 6: Final answer
   x = 147,379.78