Finding the Third Proportional to 15,288.38 and 21,811.88

Step by Step Solution

1. Step 1: Write the proportion equation
   15,288.38 : 21,811.88 = 21,811.88 : x
2. Step 2: Convert to fraction form
   15,288.38/21,811.88 = 21,811.88/x
3. Step 3: Cross multiply
   15,288.38x = 21,811.88 × 21,811.88
4. Step 4: Simplify right side
   15,288.38x = 475,757,891.02
5. Step 5: Solve for x
   x = 475,757,891.02/15,288.38
6. Step 6: Final answer
   x = 31,118.93