Finding the Third Proportional to 99,903 and 208,986

Step by Step Solution

1. Step 1: Write the proportion equation
   99,903 : 208,986 = 208,986 : x
2. Step 2: Convert to fraction form
   99,903/208,986 = 208,986/x
3. Step 3: Cross multiply
   99,903x = 208,986 × 208,986
4. Step 4: Simplify right side
   99,903x = 43,675,148,196
5. Step 5: Solve for x
   x = 43,675,148,196/99,903
6. Step 6: Final answer
   x = 437,175.54