Finding the Third Proportional to 368,129 and 788,710

Step by Step Solution

1. Step 1: Write the proportion equation
   368,129 : 788,710 = 788,710 : x
2. Step 2: Convert to fraction form
   368,129/788,710 = 788,710/x
3. Step 3: Cross multiply
   368,129x = 788,710 × 788,710
4. Step 4: Simplify right side
   368,129x = 622,063,464,100
5. Step 5: Solve for x
   x = 622,063,464,100/368,129
6. Step 6: Final answer
   x = 1,689,797.50