Finding the Third Proportional to 39,007.50 and 91,990.50

Step by Step Solution

1. Step 1: Write the proportion equation
   39,007.50 : 91,990.50 = 91,990.50 : x
2. Step 2: Convert to fraction form
   39,007.50/91,990.50 = 91,990.50/x
3. Step 3: Cross multiply
   39,007.50x = 91,990.50 × 91,990.50
4. Step 4: Simplify right side
   39,007.50x = 8,462,252,090.25
5. Step 5: Solve for x
   x = 8,462,252,090.25/39,007.50
6. Step 6: Final answer
   x = 216,939.10