Finding the Third Proportional to 45,139.50 and 69,855.75

Step by Step Solution

1. Step 1: Write the proportion equation
   45,139.50 : 69,855.75 = 69,855.75 : x
2. Step 2: Convert to fraction form
   45,139.50/69,855.75 = 69,855.75/x
3. Step 3: Cross multiply
   45,139.50x = 69,855.75 × 69,855.75
4. Step 4: Simplify right side
   45,139.50x = 4,879,825,808.06
5. Step 5: Solve for x
   x = 4,879,825,808.06/45,139.50
6. Step 6: Final answer
   x = 108,105.45