Finding the Third Proportional to 139,873.50 and 299,379.38

Step by Step Solution

1. Step 1: Write the proportion equation
   139,873.50 : 299,379.38 = 299,379.38 : x
2. Step 2: Convert to fraction form
   139,873.50/299,379.38 = 299,379.38/x
3. Step 3: Cross multiply
   139,873.50x = 299,379.38 × 299,379.38
4. Step 4: Simplify right side
   139,873.50x = 89,628,010,175.39
5. Step 5: Solve for x
   x = 89,628,010,175.39/139,873.50
6. Step 6: Final answer
   x = 640,779.06