Finding the Third Proportional to 128,884.50 and 282,985

Step by Step Solution

1. Step 1: Write the proportion equation
   128,884.50 : 282,985 = 282,985 : x
2. Step 2: Convert to fraction form
   128,884.50/282,985 = 282,985/x
3. Step 3: Cross multiply
   128,884.50x = 282,985 × 282,985
4. Step 4: Simplify right side
   128,884.50x = 80,080,510,225
5. Step 5: Solve for x
   x = 80,080,510,225/128,884.50
6. Step 6: Final answer
   x = 621,335.46