Finding the Third Proportional to 289,770 and 443,261.25

Step by Step Solution

1. Step 1: Write the proportion equation
   289,770 : 443,261.25 = 443,261.25 : x
2. Step 2: Convert to fraction form
   289,770/443,261.25 = 443,261.25/x
3. Step 3: Cross multiply
   289,770x = 443,261.25 × 443,261.25
4. Step 4: Simplify right side
   289,770x = 196,480,535,751.56
5. Step 5: Solve for x
   x = 196,480,535,751.56/289,770
6. Step 6: Final answer
   x = 678,056.86