Finding the Third Proportional to 289,990.50 and 443,652

Step by Step Solution

1. Step 1: Write the proportion equation
   289,990.50 : 443,652 = 443,652 : x
2. Step 2: Convert to fraction form
   289,990.50/443,652 = 443,652/x
3. Step 3: Cross multiply
   289,990.50x = 443,652 × 443,652
4. Step 4: Simplify right side
   289,990.50x = 196,827,097,104
5. Step 5: Solve for x
   x = 196,827,097,104/289,990.50
6. Step 6: Final answer
   x = 678,736.36