Finding the Third Proportional to 210,423 and 318,145.50

Step by Step Solution

1. Step 1: Write the proportion equation
   210,423 : 318,145.50 = 318,145.50 : x
2. Step 2: Convert to fraction form
   210,423/318,145.50 = 318,145.50/x
3. Step 3: Cross multiply
   210,423x = 318,145.50 × 318,145.50
4. Step 4: Simplify right side
   210,423x = 101,216,559,170.25
5. Step 5: Solve for x
   x = 101,216,559,170.25/210,423
6. Step 6: Final answer
   x = 481,014.71