Finding the Third Proportional to 69,321.75 and 141,921.75

Step by Step Solution

1. Step 1: Write the proportion equation
   69,321.75 : 141,921.75 = 141,921.75 : x
2. Step 2: Convert to fraction form
   69,321.75/141,921.75 = 141,921.75/x
3. Step 3: Cross multiply
   69,321.75x = 141,921.75 × 141,921.75
4. Step 4: Simplify right side
   69,321.75x = 20,141,783,123.06
5. Step 5: Solve for x
   x = 20,141,783,123.06/69,321.75
6. Step 6: Final answer
   x = 290,555.03