Finding the Third Proportional to 15,129.56 and 31,991.06

Step by Step Solution

1. Step 1: Write the proportion equation
   15,129.56 : 31,991.06 = 31,991.06 : x
2. Step 2: Convert to fraction form
   15,129.56/31,991.06 = 31,991.06/x
3. Step 3: Cross multiply
   15,129.56x = 31,991.06 × 31,991.06
4. Step 4: Simplify right side
   15,129.56x = 1,023,428,079.88
5. Step 5: Solve for x
   x = 1,023,428,079.88/15,129.56
6. Step 6: Final answer
   x = 67,644.26