Finding the Third Proportional to 99,339 and 212,884.50

Step by Step Solution

1. Step 1: Write the proportion equation
   99,339 : 212,884.50 = 212,884.50 : x
2. Step 2: Convert to fraction form
   99,339/212,884.50 = 212,884.50/x
3. Step 3: Cross multiply
   99,339x = 212,884.50 × 212,884.50
4. Step 4: Simplify right side
   99,339x = 45,319,810,340.25
5. Step 5: Solve for x
   x = 45,319,810,340.25/99,339
6. Step 6: Final answer
   x = 456,213.68