Finding the Third Proportional to 53,718.19 and 80,782.31

Step by Step Solution

1. Step 1: Write the proportion equation
   53,718.19 : 80,782.31 = 80,782.31 : x
2. Step 2: Convert to fraction form
   53,718.19/80,782.31 = 80,782.31/x
3. Step 3: Cross multiply
   53,718.19x = 80,782.31 × 80,782.31
4. Step 4: Simplify right side
   53,718.19x = 6,525,782,012.85
5. Step 5: Solve for x
   x = 6,525,782,012.85/53,718.19
6. Step 6: Final answer
   x = 121,481.80