Finding the Third Proportional to 31,438.13 and 67,557.80

Step by Step Solution

1. Step 1: Write the proportion equation
   31,438.13 : 67,557.80 = 67,557.80 : x
2. Step 2: Convert to fraction form
   31,438.13/67,557.80 = 67,557.80/x
3. Step 3: Cross multiply
   31,438.13x = 67,557.80 × 67,557.80
4. Step 4: Simplify right side
   31,438.13x = 4,564,055,918.60
5. Step 5: Solve for x
   x = 4,564,055,918.60/31,438.13
6. Step 6: Final answer
   x = 145,175.83