Finding the Third Proportional to 53,778 and 85,131

Step by Step Solution

1. Step 1: Write the proportion equation
   53,778 : 85,131 = 85,131 : x
2. Step 2: Convert to fraction form
   53,778/85,131 = 85,131/x
3. Step 3: Cross multiply
   53,778x = 85,131 × 85,131
4. Step 4: Simplify right side
   53,778x = 7,247,287,161
5. Step 5: Solve for x
   x = 7,247,287,161/53,778
6. Step 6: Final answer
   x = 134,763.05