Finding the Third Proportional to 53,290 and 80,072

Step by Step Solution

1. Step 1: Write the proportion equation
   53,290 : 80,072 = 80,072 : x
2. Step 2: Convert to fraction form
   53,290/80,072 = 80,072/x
3. Step 3: Cross multiply
   53,290x = 80,072 × 80,072
4. Step 4: Simplify right side
   53,290x = 6,411,525,184
5. Step 5: Solve for x
   x = 6,411,525,184/53,290
6. Step 6: Final answer
   x = 120,313.85