Finding the Third Proportional to 143,510.50 and 312,855.50

Step by Step Solution

1. Step 1: Write the proportion equation
   143,510.50 : 312,855.50 = 312,855.50 : x
2. Step 2: Convert to fraction form
   143,510.50/312,855.50 = 312,855.50/x
3. Step 3: Cross multiply
   143,510.50x = 312,855.50 × 312,855.50
4. Step 4: Simplify right side
   143,510.50x = 97,878,563,880.25
5. Step 5: Solve for x
   x = 97,878,563,880.25/143,510.50
6. Step 6: Final answer
   x = 682,030.68