Finding the Third Proportional to 199.78 and 436.59

Step by Step Solution

1. Step 1: Write the proportion equation
   199.78 : 436.59 = 436.59 : x
2. Step 2: Convert to fraction form
   199.78/436.59 = 436.59/x
3. Step 3: Cross multiply
   199.78x = 436.59 × 436.59
4. Step 4: Simplify right side
   199.78x = 190,614.10
5. Step 5: Solve for x
   x = 190,614.10/199.78
6. Step 6: Final answer
   x = 954.11