Finding the Third Proportional to 15,858 and 21,361.50

Step by Step Solution

1. Step 1: Write the proportion equation
   15,858 : 21,361.50 = 21,361.50 : x
2. Step 2: Convert to fraction form
   15,858/21,361.50 = 21,361.50/x
3. Step 3: Cross multiply
   15,858x = 21,361.50 × 21,361.50
4. Step 4: Simplify right side
   15,858x = 456,313,682.25
5. Step 5: Solve for x
   x = 456,313,682.25/15,858
6. Step 6: Final answer
   x = 28,774.98