Finding the Third Proportional to 64,689.75 and 141,448.50

Step by Step Solution

1. Step 1: Write the proportion equation
   64,689.75 : 141,448.50 = 141,448.50 : x
2. Step 2: Convert to fraction form
   64,689.75/141,448.50 = 141,448.50/x
3. Step 3: Cross multiply
   64,689.75x = 141,448.50 × 141,448.50
4. Step 4: Simplify right side
   64,689.75x = 20,007,678,152.25
5. Step 5: Solve for x
   x = 20,007,678,152.25/64,689.75
6. Step 6: Final answer
   x = 309,286.68