Finding the Third Proportional to 31,615.31 and 66,153.38

Step by Step Solution

1. Step 1: Write the proportion equation
   31,615.31 : 66,153.38 = 66,153.38 : x
2. Step 2: Convert to fraction form
   31,615.31/66,153.38 = 66,153.38/x
3. Step 3: Cross multiply
   31,615.31x = 66,153.38 × 66,153.38
4. Step 4: Simplify right side
   31,615.31x = 4,376,269,023.89
5. Step 5: Solve for x
   x = 4,376,269,023.89/31,615.31
6. Step 6: Final answer
   x = 138,422.45