Finding the Third Proportional to 42,210.50 and 66,839.25

Step by Step Solution

1. Step 1: Write the proportion equation
   42,210.50 : 66,839.25 = 66,839.25 : x
2. Step 2: Convert to fraction form
   42,210.50/66,839.25 = 66,839.25/x
3. Step 3: Cross multiply
   42,210.50x = 66,839.25 × 66,839.25
4. Step 4: Simplify right side
   42,210.50x = 4,467,485,340.56
5. Step 5: Solve for x
   x = 4,467,485,340.56/42,210.50
6. Step 6: Final answer
   x = 105,838.25