Finding the Third Proportional to 199,819.50 and 427,980

Step by Step Solution

1. Step 1: Write the proportion equation
   199,819.50 : 427,980 = 427,980 : x
2. Step 2: Convert to fraction form
   199,819.50/427,980 = 427,980/x
3. Step 3: Cross multiply
   199,819.50x = 427,980 × 427,980
4. Step 4: Simplify right side
   199,819.50x = 183,166,880,400
5. Step 5: Solve for x
   x = 183,166,880,400/199,819.50
6. Step 6: Final answer
   x = 916,661.69