Finding the Third Proportional to 42,619.50 and 66,858

Step by Step Solution

1. Step 1: Write the proportion equation
   42,619.50 : 66,858 = 66,858 : x
2. Step 2: Convert to fraction form
   42,619.50/66,858 = 66,858/x
3. Step 3: Cross multiply
   42,619.50x = 66,858 × 66,858
4. Step 4: Simplify right side
   42,619.50x = 4,469,992,164
5. Step 5: Solve for x
   x = 4,469,992,164/42,619.50
6. Step 6: Final answer
   x = 104,881.38