Finding the Third Proportional to 31,990.50 and 66,030

Step by Step Solution

1. Step 1: Write the proportion equation
   31,990.50 : 66,030 = 66,030 : x
2. Step 2: Convert to fraction form
   31,990.50/66,030 = 66,030/x
3. Step 3: Cross multiply
   31,990.50x = 66,030 × 66,030
4. Step 4: Simplify right side
   31,990.50x = 4,359,960,900
5. Step 5: Solve for x
   x = 4,359,960,900/31,990.50
6. Step 6: Final answer
   x = 136,289.24