Finding the Third Proportional to 42,620.50 and 66,860.50

Step by Step Solution

1. Step 1: Write the proportion equation
   42,620.50 : 66,860.50 = 66,860.50 : x
2. Step 2: Convert to fraction form
   42,620.50/66,860.50 = 66,860.50/x
3. Step 3: Cross multiply
   42,620.50x = 66,860.50 × 66,860.50
4. Step 4: Simplify right side
   42,620.50x = 4,470,326,460.25
5. Step 5: Solve for x
   x = 4,470,326,460.25/42,620.50
6. Step 6: Final answer
   x = 104,886.77