Finding the Third Proportional to 2,870.72 and 4,390.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,870.72 : 4,390.88 = 4,390.88 : x
2. Step 2: Convert to fraction form
   2,870.72/4,390.88 = 4,390.88/x
3. Step 3: Cross multiply
   2,870.72x = 4,390.88 × 4,390.88
4. Step 4: Simplify right side
   2,870.72x = 19,279,783.27
5. Step 5: Solve for x
   x = 19,279,783.27/2,870.72
6. Step 6: Final answer
   x = 6,716.01