Finding the Third Proportional to 99,300 and 212,813.50

Step by Step Solution

1. Step 1: Write the proportion equation
   99,300 : 212,813.50 = 212,813.50 : x
2. Step 2: Convert to fraction form
   99,300/212,813.50 = 212,813.50/x
3. Step 3: Cross multiply
   99,300x = 212,813.50 × 212,813.50
4. Step 4: Simplify right side
   99,300x = 45,289,585,782.25
5. Step 5: Solve for x
   x = 45,289,585,782.25/99,300
6. Step 6: Final answer
   x = 456,088.48