Finding the Third Proportional to 55,172 and 87,404

Step by Step Solution

1. Step 1: Write the proportion equation
   55,172 : 87,404 = 87,404 : x
2. Step 2: Convert to fraction form
   55,172/87,404 = 87,404/x
3. Step 3: Cross multiply
   55,172x = 87,404 × 87,404
4. Step 4: Simplify right side
   55,172x = 7,639,459,216
5. Step 5: Solve for x
   x = 7,639,459,216/55,172
6. Step 6: Final answer
   x = 138,466.24