Finding the Third Proportional to 12,978 and 28,276

Step by Step Solution

1. Step 1: Write the proportion equation
   12,978 : 28,276 = 28,276 : x
2. Step 2: Convert to fraction form
   12,978/28,276 = 28,276/x
3. Step 3: Cross multiply
   12,978x = 28,276 × 28,276
4. Step 4: Simplify right side
   12,978x = 799,532,176
5. Step 5: Solve for x
   x = 799,532,176/12,978
6. Step 6: Final answer
   x = 61,606.73