Finding the Third Proportional to 5,454.84 and 8,340.86

Step by Step Solution

1. Step 1: Write the proportion equation
   5,454.84 : 8,340.86 = 8,340.86 : x
2. Step 2: Convert to fraction form
   5,454.84/8,340.86 = 8,340.86/x
3. Step 3: Cross multiply
   5,454.84x = 8,340.86 × 8,340.86
4. Step 4: Simplify right side
   5,454.84x = 69,570,016.57
5. Step 5: Solve for x
   x = 69,570,016.57/5,454.84
6. Step 6: Final answer
   x = 12,753.81