Finding the Third Proportional to 31,438.13 and 68,419.69

Step by Step Solution

1. Step 1: Write the proportion equation
   31,438.13 : 68,419.69 = 68,419.69 : x
2. Step 2: Convert to fraction form
   31,438.13/68,419.69 = 68,419.69/x
3. Step 3: Cross multiply
   31,438.13x = 68,419.69 × 68,419.69
4. Step 4: Simplify right side
   31,438.13x = 4,681,253,637.60
5. Step 5: Solve for x
   x = 4,681,253,637.60/31,438.13
6. Step 6: Final answer
   x = 148,903.72