Finding the Third Proportional to 40,291.50 and 56,639.25

Step by Step Solution

1. Step 1: Write the proportion equation
   40,291.50 : 56,639.25 = 56,639.25 : x
2. Step 2: Convert to fraction form
   40,291.50/56,639.25 = 56,639.25/x
3. Step 3: Cross multiply
   40,291.50x = 56,639.25 × 56,639.25
4. Step 4: Simplify right side
   40,291.50x = 3,208,004,640.56
5. Step 5: Solve for x
   x = 3,208,004,640.56/40,291.50
6. Step 6: Final answer
   x = 79,619.89