Finding the Third Proportional to 103,981.25 and 212,889.50

Step by Step Solution

1. Step 1: Write the proportion equation
   103,981.25 : 212,889.50 = 212,889.50 : x
2. Step 2: Convert to fraction form
   103,981.25/212,889.50 = 212,889.50/x
3. Step 3: Cross multiply
   103,981.25x = 212,889.50 × 212,889.50
4. Step 4: Simplify right side
   103,981.25x = 45,321,939,210.25
5. Step 5: Solve for x
   x = 45,321,939,210.25/103,981.25
6. Step 6: Final answer
   x = 435,866.46