Finding the Third Proportional to 207,258 and 316,900.50

Step by Step Solution

1. Step 1: Write the proportion equation
   207,258 : 316,900.50 = 316,900.50 : x
2. Step 2: Convert to fraction form
   207,258/316,900.50 = 316,900.50/x
3. Step 3: Cross multiply
   207,258x = 316,900.50 × 316,900.50
4. Step 4: Simplify right side
   207,258x = 100,425,926,900.25
5. Step 5: Solve for x
   x = 100,425,926,900.25/207,258
6. Step 6: Final answer
   x = 484,545.48