Finding the Third Proportional to 2,790.56 and 4,221.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,790.56 : 4,221.94 = 4,221.94 : x
2. Step 2: Convert to fraction form
   2,790.56/4,221.94 = 4,221.94/x
3. Step 3: Cross multiply
   2,790.56x = 4,221.94 × 4,221.94
4. Step 4: Simplify right side
   2,790.56x = 17,824,756.25
5. Step 5: Solve for x
   x = 17,824,756.25/2,790.56
6. Step 6: Final answer
   x = 6,387.51