Finding the Third Proportional to 5,389.88 and 8,366.63

Step by Step Solution

1. Step 1: Write the proportion equation
   5,389.88 : 8,366.63 = 8,366.63 : x
2. Step 2: Convert to fraction form
   5,389.88/8,366.63 = 8,366.63/x
3. Step 3: Cross multiply
   5,389.88x = 8,366.63 × 8,366.63
4. Step 4: Simplify right side
   5,389.88x = 70,000,413.89
5. Step 5: Solve for x
   x = 70,000,413.89/5,389.88
6. Step 6: Final answer
   x = 12,987.39