Finding the Third Proportional to 34,139.25 and 69,918.75

Step by Step Solution

1. Step 1: Write the proportion equation
   34,139.25 : 69,918.75 = 69,918.75 : x
2. Step 2: Convert to fraction form
   34,139.25/69,918.75 = 69,918.75/x
3. Step 3: Cross multiply
   34,139.25x = 69,918.75 × 69,918.75
4. Step 4: Simplify right side
   34,139.25x = 4,888,631,601.56
5. Step 5: Solve for x
   x = 4,888,631,601.56/34,139.25
6. Step 6: Final answer
   x = 143,196.81