Finding the Third Proportional to 12,888 and 28,120

Step by Step Solution

1. Step 1: Write the proportion equation
   12,888 : 28,120 = 28,120 : x
2. Step 2: Convert to fraction form
   12,888/28,120 = 28,120/x
3. Step 3: Cross multiply
   12,888x = 28,120 × 28,120
4. Step 4: Simplify right side
   12,888x = 790,734,400
5. Step 5: Solve for x
   x = 790,734,400/12,888
6. Step 6: Final answer
   x = 61,354.31