Finding the Third Proportional to 100,607.91 and 213,209.72

Step by Step Solution

1. Step 1: Write the proportion equation
   100,607.91 : 213,209.72 = 213,209.72 : x
2. Step 2: Convert to fraction form
   100,607.91/213,209.72 = 213,209.72/x
3. Step 3: Cross multiply
   100,607.91x = 213,209.72 × 213,209.72
4. Step 4: Simplify right side
   100,607.91x = 45,458,384,169.45
5. Step 5: Solve for x
   x = 45,458,384,169.45/100,607.91
6. Step 6: Final answer
   x = 451,837.10