Finding the Third Proportional to 59,412 and 128,520

Step by Step Solution

1. Step 1: Write the proportion equation
   59,412 : 128,520 = 128,520 : x
2. Step 2: Convert to fraction form
   59,412/128,520 = 128,520/x
3. Step 3: Cross multiply
   59,412x = 128,520 × 128,520
4. Step 4: Simplify right side
   59,412x = 16,517,390,400
5. Step 5: Solve for x
   x = 16,517,390,400/59,412
6. Step 6: Final answer
   x = 278,014.38