Finding the Third Proportional to 31,288.50 and 63,663.75

Step by Step Solution

1. Step 1: Write the proportion equation
   31,288.50 : 63,663.75 = 63,663.75 : x
2. Step 2: Convert to fraction form
   31,288.50/63,663.75 = 63,663.75/x
3. Step 3: Cross multiply
   31,288.50x = 63,663.75 × 63,663.75
4. Step 4: Simplify right side
   31,288.50x = 4,053,073,064.06
5. Step 5: Solve for x
   x = 4,053,073,064.06/31,288.50
6. Step 6: Final answer
   x = 129,538.75