Finding the Third Proportional to 249,258 and 386,688.38

Step by Step Solution

1. Step 1: Write the proportion equation
   249,258 : 386,688.38 = 386,688.38 : x
2. Step 2: Convert to fraction form
   249,258/386,688.38 = 386,688.38/x
3. Step 3: Cross multiply
   249,258x = 386,688.38 × 386,688.38
4. Step 4: Simplify right side
   249,258x = 149,527,899,360.14
5. Step 5: Solve for x
   x = 149,527,899,360.14/249,258
6. Step 6: Final answer
   x = 599,892.08