Finding the Third Proportional to 15,120.75 and 21,499.50

Step by Step Solution

1. Step 1: Write the proportion equation
   15,120.75 : 21,499.50 = 21,499.50 : x
2. Step 2: Convert to fraction form
   15,120.75/21,499.50 = 21,499.50/x
3. Step 3: Cross multiply
   15,120.75x = 21,499.50 × 21,499.50
4. Step 4: Simplify right side
   15,120.75x = 462,228,500.25
5. Step 5: Solve for x
   x = 462,228,500.25/15,120.75
6. Step 6: Final answer
   x = 30,569.15