Finding the Third Proportional to 31,691.63 and 67,881.75

Step by Step Solution

1. Step 1: Write the proportion equation
   31,691.63 : 67,881.75 = 67,881.75 : x
2. Step 2: Convert to fraction form
   31,691.63/67,881.75 = 67,881.75/x
3. Step 3: Cross multiply
   31,691.63x = 67,881.75 × 67,881.75
4. Step 4: Simplify right side
   31,691.63x = 4,607,931,983.06
5. Step 5: Solve for x
   x = 4,607,931,983.06/31,691.63
6. Step 6: Final answer
   x = 145,399.04