Finding the Third Proportional to 289,983 and 443,641.50

Step by Step Solution

1. Step 1: Write the proportion equation
   289,983 : 443,641.50 = 443,641.50 : x
2. Step 2: Convert to fraction form
   289,983/443,641.50 = 443,641.50/x
3. Step 3: Cross multiply
   289,983x = 443,641.50 × 443,641.50
4. Step 4: Simplify right side
   289,983x = 196,817,780,522.25
5. Step 5: Solve for x
   x = 196,817,780,522.25/289,983
6. Step 6: Final answer
   x = 678,721.79