Finding the Third Proportional to 149,017.50 and 319,341.38

Step by Step Solution

1. Step 1: Write the proportion equation
   149,017.50 : 319,341.38 = 319,341.38 : x
2. Step 2: Convert to fraction form
   149,017.50/319,341.38 = 319,341.38/x
3. Step 3: Cross multiply
   149,017.50x = 319,341.38 × 319,341.38
4. Step 4: Simplify right side
   149,017.50x = 101,978,913,786.89
5. Step 5: Solve for x
   x = 101,978,913,786.89/149,017.50
6. Step 6: Final answer
   x = 684,341.86