Finding the Third Proportional to 17,815.50 and 19,455.75

Step by Step Solution

1. Step 1: Write the proportion equation
   17,815.50 : 19,455.75 = 19,455.75 : x
2. Step 2: Convert to fraction form
   17,815.50/19,455.75 = 19,455.75/x
3. Step 3: Cross multiply
   17,815.50x = 19,455.75 × 19,455.75
4. Step 4: Simplify right side
   17,815.50x = 378,526,208.06
5. Step 5: Solve for x
   x = 378,526,208.06/17,815.50
6. Step 6: Final answer
   x = 21,247.02