Finding the Third Proportional to 12,289.50 and 28,890

Step by Step Solution

1. Step 1: Write the proportion equation
   12,289.50 : 28,890 = 28,890 : x
2. Step 2: Convert to fraction form
   12,289.50/28,890 = 28,890/x
3. Step 3: Cross multiply
   12,289.50x = 28,890 × 28,890
4. Step 4: Simplify right side
   12,289.50x = 834,632,100
5. Step 5: Solve for x
   x = 834,632,100/12,289.50
6. Step 6: Final answer
   x = 67,914.24