Finding the Third Proportional to 12,499.31 and 18,711

Step by Step Solution

1. Step 1: Write the proportion equation
   12,499.31 : 18,711 = 18,711 : x
2. Step 2: Convert to fraction form
   12,499.31/18,711 = 18,711/x
3. Step 3: Cross multiply
   12,499.31x = 18,711 × 18,711
4. Step 4: Simplify right side
   12,499.31x = 350,101,521
5. Step 5: Solve for x
   x = 350,101,521/12,499.31
6. Step 6: Final answer
   x = 28,009.66