Finding the Third Proportional to 64,959.75 and 142,321.50

Step by Step Solution

1. Step 1: Write the proportion equation
   64,959.75 : 142,321.50 = 142,321.50 : x
2. Step 2: Convert to fraction form
   64,959.75/142,321.50 = 142,321.50/x
3. Step 3: Cross multiply
   64,959.75x = 142,321.50 × 142,321.50
4. Step 4: Simplify right side
   64,959.75x = 20,255,409,362.25
5. Step 5: Solve for x
   x = 20,255,409,362.25/64,959.75
6. Step 6: Final answer
   x = 311,814.77