Finding the Third Proportional to 143,786 and 312,411.50

Step by Step Solution

1. Step 1: Write the proportion equation
   143,786 : 312,411.50 = 312,411.50 : x
2. Step 2: Convert to fraction form
   143,786/312,411.50 = 312,411.50/x
3. Step 3: Cross multiply
   143,786x = 312,411.50 × 312,411.50
4. Step 4: Simplify right side
   143,786x = 97,600,945,332.25
5. Step 5: Solve for x
   x = 97,600,945,332.25/143,786
6. Step 6: Final answer
   x = 678,793.10