Finding the Third Proportional to 426,499.50 and 918,609

Step by Step Solution

1. Step 1: Write the proportion equation
   426,499.50 : 918,609 = 918,609 : x
2. Step 2: Convert to fraction form
   426,499.50/918,609 = 918,609/x
3. Step 3: Cross multiply
   426,499.50x = 918,609 × 918,609
4. Step 4: Simplify right side
   426,499.50x = 843,842,494,881
5. Step 5: Solve for x
   x = 843,842,494,881/426,499.50
6. Step 6: Final answer
   x = 1,978,531.03