Finding the Third Proportional to 147,379.50 and 315,789

Step by Step Solution

1. Step 1: Write the proportion equation
   147,379.50 : 315,789 = 315,789 : x
2. Step 2: Convert to fraction form
   147,379.50/315,789 = 315,789/x
3. Step 3: Cross multiply
   147,379.50x = 315,789 × 315,789
4. Step 4: Simplify right side
   147,379.50x = 99,722,692,521
5. Step 5: Solve for x
   x = 99,722,692,521/147,379.50
6. Step 6: Final answer
   x = 676,638.83