Finding the Third Proportional to 207,789 and 316,057.50

Step by Step Solution

1. Step 1: Write the proportion equation
   207,789 : 316,057.50 = 316,057.50 : x
2. Step 2: Convert to fraction form
   207,789/316,057.50 = 316,057.50/x
3. Step 3: Cross multiply
   207,789x = 316,057.50 × 316,057.50
4. Step 4: Simplify right side
   207,789x = 99,892,343,306.25
5. Step 5: Solve for x
   x = 99,892,343,306.25/207,789
6. Step 6: Final answer
   x = 480,739.32