Finding the Third Proportional to 42,120 and 65,706

Step by Step Solution

1. Step 1: Write the proportion equation
   42,120 : 65,706 = 65,706 : x
2. Step 2: Convert to fraction form
   42,120/65,706 = 65,706/x
3. Step 3: Cross multiply
   42,120x = 65,706 × 65,706
4. Step 4: Simplify right side
   42,120x = 4,317,278,436
5. Step 5: Solve for x
   x = 4,317,278,436/42,120
6. Step 6: Final answer
   x = 102,499.49