Finding the Third Proportional to 42,908.50 and 66,438.50

Step by Step Solution

1. Step 1: Write the proportion equation
   42,908.50 : 66,438.50 = 66,438.50 : x
2. Step 2: Convert to fraction form
   42,908.50/66,438.50 = 66,438.50/x
3. Step 3: Cross multiply
   42,908.50x = 66,438.50 × 66,438.50
4. Step 4: Simplify right side
   42,908.50x = 4,414,074,282.25
5. Step 5: Solve for x
   x = 4,414,074,282.25/42,908.50
6. Step 6: Final answer
   x = 102,871.79