Finding the Third Proportional to 143,491.50 and 312,819

Step by Step Solution

1. Step 1: Write the proportion equation
   143,491.50 : 312,819 = 312,819 : x
2. Step 2: Convert to fraction form
   143,491.50/312,819 = 312,819/x
3. Step 3: Cross multiply
   143,491.50x = 312,819 × 312,819
4. Step 4: Simplify right side
   143,491.50x = 97,855,726,761
5. Step 5: Solve for x
   x = 97,855,726,761/143,491.50
6. Step 6: Final answer
   x = 681,961.84