Finding the Third Proportional to 42,225 and 66,858.50

Step by Step Solution

1. Step 1: Write the proportion equation
   42,225 : 66,858.50 = 66,858.50 : x
2. Step 2: Convert to fraction form
   42,225/66,858.50 = 66,858.50/x
3. Step 3: Cross multiply
   42,225x = 66,858.50 × 66,858.50
4. Step 4: Simplify right side
   42,225x = 4,470,059,022.25
5. Step 5: Solve for x
   x = 4,470,059,022.25/42,225
6. Step 6: Final answer
   x = 105,862.85