Finding the Third Proportional to 42,212.50 and 66,842.50

Step by Step Solution

1. Step 1: Write the proportion equation
   42,212.50 : 66,842.50 = 66,842.50 : x
2. Step 2: Convert to fraction form
   42,212.50/66,842.50 = 66,842.50/x
3. Step 3: Cross multiply
   42,212.50x = 66,842.50 × 66,842.50
4. Step 4: Simplify right side
   42,212.50x = 4,467,919,806.25
5. Step 5: Solve for x
   x = 4,467,919,806.25/42,212.50
6. Step 6: Final answer
   x = 105,843.53