Finding the Third Proportional to 31,419.14 and 66,069.42

Step by Step Solution

1. Step 1: Write the proportion equation
   31,419.14 : 66,069.42 = 66,069.42 : x
2. Step 2: Convert to fraction form
   31,419.14/66,069.42 = 66,069.42/x
3. Step 3: Cross multiply
   31,419.14x = 66,069.42 × 66,069.42
4. Step 4: Simplify right side
   31,419.14x = 4,365,168,506.90
5. Step 5: Solve for x
   x = 4,365,168,506.90/31,419.14
6. Step 6: Final answer
   x = 138,933.42