Finding the Third Proportional to 11,128 and 15,558

Step by Step Solution

1. Step 1: Write the proportion equation
   11,128 : 15,558 = 15,558 : x
2. Step 2: Convert to fraction form
   11,128/15,558 = 15,558/x
3. Step 3: Cross multiply
   11,128x = 15,558 × 15,558
4. Step 4: Simplify right side
   11,128x = 242,051,364
5. Step 5: Solve for x
   x = 242,051,364/11,128
6. Step 6: Final answer
   x = 21,751.56