Finding the Third Proportional to 103,985.50 and 212,888

Step by Step Solution

1. Step 1: Write the proportion equation
   103,985.50 : 212,888 = 212,888 : x
2. Step 2: Convert to fraction form
   103,985.50/212,888 = 212,888/x
3. Step 3: Cross multiply
   103,985.50x = 212,888 × 212,888
4. Step 4: Simplify right side
   103,985.50x = 45,321,300,544
5. Step 5: Solve for x
   x = 45,321,300,544/103,985.50
6. Step 6: Final answer
   x = 435,842.50