Finding the Third Proportional to 69,619.50 and 142,519.50

Step by Step Solution

1. Step 1: Write the proportion equation
   69,619.50 : 142,519.50 = 142,519.50 : x
2. Step 2: Convert to fraction form
   69,619.50/142,519.50 = 142,519.50/x
3. Step 3: Cross multiply
   69,619.50x = 142,519.50 × 142,519.50
4. Step 4: Simplify right side
   69,619.50x = 20,311,807,880.25
5. Step 5: Solve for x
   x = 20,311,807,880.25/69,619.50
6. Step 6: Final answer
   x = 291,754.58