Finding the Third Proportional to 354,667.50 and 778,239

Step by Step Solution

1. Step 1: Write the proportion equation
   354,667.50 : 778,239 = 778,239 : x
2. Step 2: Convert to fraction form
   354,667.50/778,239 = 778,239/x
3. Step 3: Cross multiply
   354,667.50x = 778,239 × 778,239
4. Step 4: Simplify right side
   354,667.50x = 605,655,941,121
5. Step 5: Solve for x
   x = 605,655,941,121/354,667.50
6. Step 6: Final answer
   x = 1,707,672.51