Finding the Third Proportional to 2,156.91 and 4,621.22

Step by Step Solution

1. Step 1: Write the proportion equation
   2,156.91 : 4,621.22 = 4,621.22 : x
2. Step 2: Convert to fraction form
   2,156.91/4,621.22 = 4,621.22/x
3. Step 3: Cross multiply
   2,156.91x = 4,621.22 × 4,621.22
4. Step 4: Simplify right side
   2,156.91x = 21,355,662.74
5. Step 5: Solve for x
   x = 21,355,662.74/2,156.91
6. Step 6: Final answer
   x = 9,901.06