Finding the Third Proportional to 103,986 and 212,899.50

Step by Step Solution

1. Step 1: Write the proportion equation
   103,986 : 212,899.50 = 212,899.50 : x
2. Step 2: Convert to fraction form
   103,986/212,899.50 = 212,899.50/x
3. Step 3: Cross multiply
   103,986x = 212,899.50 × 212,899.50
4. Step 4: Simplify right side
   103,986x = 45,326,197,100.25
5. Step 5: Solve for x
   x = 45,326,197,100.25/103,986
6. Step 6: Final answer
   x = 435,887.50