Finding the Third Proportional to 8,777.59 and 12,420.03

Step by Step Solution

1. Step 1: Write the proportion equation
   8,777.59 : 12,420.03 = 12,420.03 : x
2. Step 2: Convert to fraction form
   8,777.59/12,420.03 = 12,420.03/x
3. Step 3: Cross multiply
   8,777.59x = 12,420.03 × 12,420.03
4. Step 4: Simplify right side
   8,777.59x = 154,257,176.25
5. Step 5: Solve for x
   x = 154,257,176.25/8,777.59
6. Step 6: Final answer
   x = 17,573.97