Finding the Third Proportional to 55,080 and 87,540

Step by Step Solution

1. Step 1: Write the proportion equation
   55,080 : 87,540 = 87,540 : x
2. Step 2: Convert to fraction form
   55,080/87,540 = 87,540/x
3. Step 3: Cross multiply
   55,080x = 87,540 × 87,540
4. Step 4: Simplify right side
   55,080x = 7,663,251,600
5. Step 5: Solve for x
   x = 7,663,251,600/55,080
6. Step 6: Final answer
   x = 139,129.48