Finding the Third Proportional to 31,731.79 and 67,538.58

Step by Step Solution

1. Step 1: Write the proportion equation
   31,731.79 : 67,538.58 = 67,538.58 : x
2. Step 2: Convert to fraction form
   31,731.79/67,538.58 = 67,538.58/x
3. Step 3: Cross multiply
   31,731.79x = 67,538.58 × 67,538.58
4. Step 4: Simplify right side
   31,731.79x = 4,561,459,139.41
5. Step 5: Solve for x
   x = 4,561,459,139.41/31,731.79
6. Step 6: Final answer
   x = 143,750.45