Finding the Third Proportional to 11,855.95 and 15,858.49

Step by Step Solution

1. Step 1: Write the proportion equation
   11,855.95 : 15,858.49 = 15,858.49 : x
2. Step 2: Convert to fraction form
   11,855.95/15,858.49 = 15,858.49/x
3. Step 3: Cross multiply
   11,855.95x = 15,858.49 × 15,858.49
4. Step 4: Simplify right side
   11,855.95x = 251,491,774.46
5. Step 5: Solve for x
   x = 251,491,774.46/11,855.95
6. Step 6: Final answer
   x = 21,212.28