Finding the Third Proportional to 12,856 and 28,040

Step by Step Solution

1. Step 1: Write the proportion equation
   12,856 : 28,040 = 28,040 : x
2. Step 2: Convert to fraction form
   12,856/28,040 = 28,040/x
3. Step 3: Cross multiply
   12,856x = 28,040 × 28,040
4. Step 4: Simplify right side
   12,856x = 786,241,600
5. Step 5: Solve for x
   x = 786,241,600/12,856
6. Step 6: Final answer
   x = 61,157.56