Finding the Third Proportional to 31,687.31 and 68,848.88

Step by Step Solution

1. Step 1: Write the proportion equation
   31,687.31 : 68,848.88 = 68,848.88 : x
2. Step 2: Convert to fraction form
   31,687.31/68,848.88 = 68,848.88/x
3. Step 3: Cross multiply
   31,687.31x = 68,848.88 × 68,848.88
4. Step 4: Simplify right side
   31,687.31x = 4,740,167,588.77
5. Step 5: Solve for x
   x = 4,740,167,588.77/31,687.31
6. Step 6: Final answer
   x = 149,591.97