Finding the Third Proportional to 427,146 and 618,685.50

Step by Step Solution

1. Step 1: Write the proportion equation
   427,146 : 618,685.50 = 618,685.50 : x
2. Step 2: Convert to fraction form
   427,146/618,685.50 = 618,685.50/x
3. Step 3: Cross multiply
   427,146x = 618,685.50 × 618,685.50
4. Step 4: Simplify right side
   427,146x = 382,771,747,910.25
5. Step 5: Solve for x
   x = 382,771,747,910.25/427,146
6. Step 6: Final answer
   x = 896,114.56