Finding the Third Proportional to 64,389.38 and 140,979.38

Step by Step Solution

1. Step 1: Write the proportion equation
   64,389.38 : 140,979.38 = 140,979.38 : x
2. Step 2: Convert to fraction form
   64,389.38/140,979.38 = 140,979.38/x
3. Step 3: Cross multiply
   64,389.38x = 140,979.38 × 140,979.38
4. Step 4: Simplify right side
   64,389.38x = 19,875,184,175.39
5. Step 5: Solve for x
   x = 19,875,184,175.39/64,389.38
6. Step 6: Final answer
   x = 308,671.80