Finding the Third Proportional to 143,685 and 312,241.50

Step by Step Solution

1. Step 1: Write the proportion equation
   143,685 : 312,241.50 = 312,241.50 : x
2. Step 2: Convert to fraction form
   143,685/312,241.50 = 312,241.50/x
3. Step 3: Cross multiply
   143,685x = 312,241.50 × 312,241.50
4. Step 4: Simplify right side
   143,685x = 97,494,754,322.25
5. Step 5: Solve for x
   x = 97,494,754,322.25/143,685
6. Step 6: Final answer
   x = 678,531.19