Finding the Third Proportional to 15,315 and 21,677.25

Step by Step Solution

1. Step 1: Write the proportion equation
   15,315 : 21,677.25 = 21,677.25 : x
2. Step 2: Convert to fraction form
   15,315/21,677.25 = 21,677.25/x
3. Step 3: Cross multiply
   15,315x = 21,677.25 × 21,677.25
4. Step 4: Simplify right side
   15,315x = 469,903,167.56
5. Step 5: Solve for x
   x = 469,903,167.56/15,315
6. Step 6: Final answer
   x = 30,682.54