Finding the Third Proportional to 286,216.50 and 445,080

Step by Step Solution

1. Step 1: Write the proportion equation
   286,216.50 : 445,080 = 445,080 : x
2. Step 2: Convert to fraction form
   286,216.50/445,080 = 445,080/x
3. Step 3: Cross multiply
   286,216.50x = 445,080 × 445,080
4. Step 4: Simplify right side
   286,216.50x = 198,096,206,400
5. Step 5: Solve for x
   x = 198,096,206,400/286,216.50
6. Step 6: Final answer
   x = 692,120.15